4x6 post cap
Worth a lookShows a sweet-spot price point ($28.32 avg), but a small market ($45K/yr) keeps it on the watch list.
Avg price
Incredible$28.32avg listing price — sweet spot $15–$100
Growth
Great+93.2%90-day search growth — must beat 0% to launch
Price range
Great$7.88–$105.49cheapest to priciest tracked listing — scored on the share inside $15–$100
Review moat
Good678.32avg incumbent reviews — the moat a new listing must climb
Conversion
Good4.4%search→purchase rate — share of searches ending in a sale
Brand share
Good74%top-5 brand share — brands hold most of the demand
Quality gap
Good4.5★avg incumbent rating — lower means beatable quality
Competition
Okay58%top-5 click share — leaders hold, buyers still browse
Returns
Okay3.8%return rate — above 5% kills the launch gate
Market size
Bad$45K$45K/yr · 36K searches
According to Flapen's Amazon United States niche tracking, 4x6 post cap is a $45K/yr Amazon United States market (36K searches/yr). The top 5 brands hold 74% of demand. Demand peaks in May–Jun–Jul–Aug. Verdict: Worth a look — 54/100.
Data updated Jul 26, 2026 · scored weekly · How we score niches
4x6 post cap market data
- Units sold / yr
- 3K–3K
- avg 100–250/product
- Revenue / yr
- $71K–$85K
- units × avg price
- Conversion rate
- 4.4%
- Avg BSR
- #98
- Page quality
- 0%
- Prime
- 82%
- Sponsored
- 100%
- Out of stock
- 1.0%
- Avg brand age
- 38 months
- Avg seller age
- 183 days
Competition & brand share
The top 5 products take 58% of clicks — established leaders, but buyers still shop beyond them.Brands
12 falling
Sellers
15
Top-5 brand share
74%
Top 20: 100%
Top-5 click share
58%
Top 20: 98%
Open market
19%
- Azdele24%
- Decorex Hardware19%
- TonGass15%
- JSP Manufacturing9%
- ATLANTA POST CAPS8%
- MOON-DE-AGE7%
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — +93.2% search growth over the last 90 days.Peak months: May, Jun, Jul, Aug · busiest ÷ quietest = 3.9×
Top 4x6 post cap search terms
- 4x6 post cap23K/yr
- 4x6 post caps8K/yr
- 4x6 fence post caps5K/yr
Top 4x6 post cap products on Amazon
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 22 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Azdele 4x6 Heavy Duty Aluminum Pyramid Post Caps Cover for 4x6 Nominal Wood Post(Actual 3.5 x 5.5 Post Size) with Matte Finish Powder Coated Surface Fences Wood Post of Decks or Corridors 4Pack
Azdele$28.204.8★1,447 rev
Decorex Hardware 4x6 Aluminum Pyramid Post Cap for True 4x6 Wood Posts Heavy-Duty Cast Rounded Safety Corners Stainless Screws Powder-Coated Black Deck & Fence Cap
Decorex Hardware$12.664.8★1,619 rev
TonGass (6-Pack Black) 4x6 (3 5/8x 5 5/8) Wood Fence Post Caps Wooden Fence Deck Post Covers Durable Plastic Water-Proof and UV-Proof Protect Wooden Poles from Cracking and Rotting
TonGass$18.324.5★388 rev
TonGass (24-Pack Black) 4x6 (3 5/8x5 5/8) Wood Fence Post Caps - Wooden Fence Cover Deck Post Cap Durable Plastic Water-Proof and UV-Proof Protect Wooden Poles from Cracking and Rotting
TonGass$32.834.4★1,605 rev
MOON-DE-AGE Solar Post Cap Lights 4x4 4x6 Fence Post Light Solar Powered 25 Lumens Deck Post Light Outdoor 3000K Warm Light IP65 Waterproof Black - 2 Pack
MOON-DE-AGE$28.604.3★450 rev
Newest
by launch date
4x6 Aluminum Post Caps Pyramid Wood Post Cap Waterproof Fence Posts Cover Deck Corridors Mailbox 2 Pack
QJWDB$20.625 rev
Dunzy 4 x 6 Heavy Duty Aluminum Pyramid Post Caps Fit 4 x 6 & 3.5 x 5.5 Nominal Wood Posts Black Matte Powder Coated Finish for Fence Deck Corridor Includes Stainless Steel Screws(8 Pack)
Dunzy$57.668 rev
Dunzy 4 x 6 Heavy Duty Aluminum Pyramid Post Caps Fit 4 x 6 & 3.5 x 5.5 Nominal Wood Posts Black Matte Powder Coated Finish for Fence Deck Corridor Includes Stainless Steel Screws(4 Pack)
Dunzy$33.138 rev
Solar Post Cap Lights 12 Pack Fence Post Solar Lights Warm White/Cool White Lighting Black Waterproof Outdoor Post Lights for Garden Patio Porch 4x4 5x5 or 6x6 Vinyl/Wooden Posts
FEACORT$56.15411 rev
Sumglicie 4x6 Black Aluminum Pyramid Post Caps Cover for 4x6 Nominal Wood Post(Actual 3.5 x 5.5 Post Size) Fence Post Caps Deck Post Cap with Matte Finish Powder Coated Surface(4 Pack)
Sumglicie$28.6693 rev
Trending
90-day click momentumDunzy 4 x 6 Heavy Duty Aluminum Pyramid Post Caps Fit 4 x 6 & 3.5 x 5.5 Nominal Wood Posts Black Matte Powder Coated Finish for Fence Deck Corridor Includes Stainless Steel Screws(8 Pack)
Dunzy$57.664.2★
MOON-DE-AGE 4x4 4x6 Fence Lights Solar Powered Outdoor Post Cap Lights Yard Deck Garden Patio Mailbox Decorations 25 Lumens 3000K Ip65 Waterproof Black - 10 Pack
MOON-DE-AGE$105.494.3★
Dunzy 4 x 6 Heavy Duty Aluminum Pyramid Post Caps Fit 4 x 6 & 3.5 x 5.5 Nominal Wood Posts Black Matte Powder Coated Finish for Fence Deck Corridor Includes Stainless Steel Screws(4 Pack)
Dunzy$33.134.2★
4x6 Post Cap (3.5x 5.5) Brown New England Pyramid Style Square Top for Outdoor Fences Mailboxes & Decks by Atlanta Post Caps
ATLANTA POST CAPS$13.774.5★
4x6 Aluminum Post Caps Pyramid Wood Post Cap Waterproof Fence Posts Cover Deck Corridors Mailbox 2 Pack
QJWDB$20.623.5★
What buyers say about 4x6 post cap
What buyers praise and complain about, mined from review topics.What buyers love
“Fit perfect”
“Good quality arrived on time no issues”
“Great light”
“Reasonable price”
“Easy to install”
“As advertised”
“Very sturdy”
“Well functioning”
“holding up well”
“they are truly heavy duty compared to box store products”
What buyers complain about
“They look small on a six x six post”
“Poor quality control”
“Wrong picture wrong type”
“Batteries dont last past 2 months”
“Absolutely do not work”
“dont count on them for lighting”
“adhesive doesn't last”
“one of the lights stays on must have a bad daylight control”
“I found out the caps could not be installed due to inaccurate size”
“the cap isnt flat so the only thing touching the post is the rim of the cap so adhesive doesnt really work- it has small holes”
Top return reasons
Common questions
- Is 4x6 post cap profitable to sell on Amazon United States?
- The niche generates $45K/yr across 22 tracked products. 0 of 3 products launched in the last 360 days are still selling. 90-day search growth is +93.2%. Flapen's verdict: Worth a look (54/100).
- How competitive is the 4x6 post cap niche?
- 12 brands and 15 sellers compete. The top 5 products take 58% of clicks and top 5 brands hold 74% of demand.
- What do buyers complain about in 4x6 post cap?
- Top complaints mined from reviews: Size-Overall, Quality-Overall, Advertised Vs Actual Product. The return rate is 3.8%.
- When does demand for 4x6 post cap peak?
- Demand peaks in May–Jun–Jul–Aug; the busiest month runs 3.9× the quietest.
- What does it cost to enter the 4x6 post cap niche?
- Listings span $7.88–$105.49; the average listing price is $28.32 (sweet spot $15–$100). The average incumbent carries 678 reviews — the moat a new listing must climb.