21mm wrench
Skip itStrong incumbent ratings (4.7★) — this niche doesn't clear our bar today.
Conversion
Incredible12.0%search→purchase rate — share of searches ending in a sale
Returns
Great1.6%return rate — above 5% kills the launch gate
Price range
Great$6.17–$41.02cheapest to priciest tracked listing — scored on the share inside $15–$100
Avg price
Good$13.70avg listing price — sweet spot $15–$100
Brand share
Good67%top-5 brand share — brands hold most of the demand
Review moat
Good1,278.1avg incumbent reviews — the moat a new listing must climb
Competition
Okay60%top-5 click share — leaders hold, buyers still browse
Growth
Bad-1.3%90-day search growth — must beat 0% to launch
Market size
Bad$88K$88K/yr · 54K searches
Quality gap
Bad4.7★avg incumbent rating — lower means beatable quality
According to Flapen's Amazon United States niche tracking, 21mm wrench is a $88K/yr Amazon United States market (54K searches/yr). The top 5 brands hold 67% of demand. Verdict: Skip it — 49/100.
Data updated Jul 29, 2026 · scored weekly · How we score niches
21mm wrench market data
- Units sold / yr
- 6K–8K
- avg 250–500/product
- Revenue / yr
- $82K–$110K
- units × avg price
- Conversion rate
- 12.0%
- Avg BSR
- #63
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 70%
- Out of stock
- 4.2%
- Avg brand age
- 59 months
- Avg seller age
- 150 days
Competition & brand share
The top 5 products take 60% of clicks — established leaders, but buyers still shop beyond them.Brands
17 falling
Sellers
38
Top-5 brand share
67%
Top 20: 100%
Top-5 click share
60%
Top 20: 100%
Open market
28%
- FLZOSPER20%
- DURATECH17%
- Egofine14%
- SORAKO10%
- TEKTON7%
- TOOLGUARDS5%
Demand & seasonality
Weekly Amazon search volume, last 102 weeks — -1.3% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.6×
Top 21mm wrench 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 20 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
FLZOSPER 21mm Metric Wrench 12-Point Box End Head Combination Wrench Spanner
FLZOSPER$6.914.8★620 rev
Egofine 21mm Ratcheting Combination Wrench Metric Industrial Grade Gear Spanner with 12-Point Design 72-Tooth Ratchet Chrome Vanadium Steel
Egofine$9.934.5★53 rev
DURATECH 21mm Combination Wrench Metric
DURATECH$9.734.6★68 rev
SORAKO 21mm Ratcheting Combination Wrench Chrome Vanadium Steel Gear Wrench Industrial Grade Cr-V Steel Gear Spanner Household Garage Tools(Metric)
SORAKO$6.944.6★95 rev
TEKTON 21 mm Combination Wrench | 18292
TEKTON$11.354.8★5,844 rev
Newest
by launch date
DURATECH 21mm Extra Long Ratcheting Wrench Double Box End
DURATECH$19.12264 rev
COYAGRIP 21mm Wrench Industrial Grade Spanner Combination Wrenches Metric with 12-Point Box End 15-Degree Offset 21mm Wrenches Chrome Vanadium Steel Mirror Polished
COYAGRIP$9.48260 rev
Egofine 21mm Ratchet Wrench Flex Head Ratcheting Combination Wrench Metric Industrial Grade Gear Spanner with 12 Point Box End 72-Teeth Ratchet Chrome Vanadium Steel
Egofine$13.78691 rev
Hordion 21mm Metric Combination Wrench Spanner with Box End and Open End
Hordion$6.1760 rev
PHITUODA 21mm Metric Combination Wrench
PHITUODA$6.4664 rev
Trending
90-day click momentum
GEARWRENCH GearBox 12 Pt. XL Flex Head Double Box Ratcheting Wrench 21mm - 86021 Black
GEARWRENCH$41.024.7★
SORAKO 21mm Ratcheting Combination Wrench Chrome Vanadium Steel Gear Wrench Industrial Grade Cr-V Steel Gear Spanner Household Garage Tools(Metric)
SORAKO$6.944.6★
DURATECH 21mm Extra Long Ratcheting Wrench Double Box End
DURATECH$19.124.8★
Hordion 21mm Metric Combination Wrench Spanner with Box End and Open End
Hordion$6.174.7★
COYAGRIP 21mm Wrench Industrial Grade Spanner Combination Wrenches Metric with 12-Point Box End 15-Degree Offset 21mm Wrenches Chrome Vanadium Steel Mirror Polished
COYAGRIP$9.484.7★
What buyers say about 21mm wrench
What buyers praise and complain about, mined from review topics.What buyers love
“Fair price”
“Appears to be well made”
“fits well”
“came as described”
“Excellent add on wrench to a set previously bought”
“theyre thin they are a good buy”
“Solid and works as expected”
“Heavy duty”
“Helped get the job done”
“Although I haven't needed to use it yet I am more comfortable to have it”
What buyers complain about
“Not a quality tool”
“Used once and broke”
“Misleading Advertising”
“Needed this tool so bad for my truck parts”
“I couldn't use it”
“it would not fit in the tight spot i needed it to be”
“Not thick like some”
Top return reasons
Common questions
- Is 21mm wrench profitable to sell on Amazon United States?
- The niche generates $88K/yr across 20 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -1.3%. Flapen's verdict: Skip it (49/100).
- How competitive is the 21mm wrench niche?
- 17 brands and 38 sellers compete. The top 5 products take 60% of clicks and top 5 brands hold 67% of demand.
- What do buyers complain about in 21mm wrench?
- Top complaints mined from reviews: Quality-Overall, Durability, Advertised Vs Actual Product. The return rate is 1.6%.
- When does demand for 21mm wrench peak?
- Demand is steady year-round — the busiest month runs 1.6× the quietest.
- What does it cost to enter the 21mm wrench niche?
- Listings span $6.17–$41.02; the average listing price is $13.70 (sweet spot $15–$100). The average incumbent carries 1,278 reviews — the moat a new listing must climb.