Klein 66031 Wrench
- Wrench
- 12
- 0.8 ounces
- 3.1 inches
- Better rated than 72%
- More reviewed than 58%
4.8 stars across 987 reviews and 500 recent purchases show buyers are satisfied, but the 3.1 inch, sub-ounce piece size is worth confirming against your actual fastener size before ordering.
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How it ranks among the 561 wrenches we track
4.8★ across 987 Amazon ratings, Bayesian-smoothed toward the category average.
987 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
500+ bought on Amazon last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 561 wrenches we track - how the scorecard works · full wrenches data report. Confidence: high - strong rating volume and complete data.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
The Klein 66031 comes as a 12-piece set with each piece measuring 3.1 inches and weighing 0.8 ounces, a size and weight far lighter than a standard wrench. Purchase volume is strong at 500 bought in the past month.
A 0.8 ounce weight per piece is closer to a small screwdriver bit or driver tip than a full-size wrench, so this set likely serves a compact or bit-style role despite the wrench label carried over from the category. Buyers expecting full-length open-end or box wrenches should double check the listing photos, since the dimensions here point to something smaller.
- Model 66031
- 12-piece set
- 3.1 inch length per piece
- 4.8 rating, 500 bought in past month
Who it's for
A 12-piece compact set like this fits repetitive small-fastener work where portability matters more than reach. Full-size wrench jobs needing real leverage are better served elsewhere, given the light per-piece weight.
Strengths and trade-offs
Drawn from this product's published specifications.
- 12 pieces in one set
- Compact 3.1 inch length per piece
- High rating (4.8) with strong recent sales (500)
- Piece weight suggests limited leverage versus full-size wrenches
- Fastener size range not stated
- No description to confirm exact use case
Performance notes
12 pieces at 0.8 ounces each keeps the whole set portable, useful for kits or field bags where bulk is a problem. The tradeoff of that light build is reduced leverage compared with full-length wrenches.
Specifications
| Brand | Klein |
|---|---|
| Model | 66031 |
| Pieces | 12 |
| Item Weight | 0.8 ounces |
| Length | 3.1 inches |
Other Klein wrenches
How it compares
This product against the closest alternatives we track in wrenches.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Klein 66031 WrenchThis product | 4.8 / 5 | 987 | 4.4 / 5 |
| Amazon AMZ1715 WrenchAmazon | 4.7 / 5 | 14,700 | 4.6 / 5 |
| Wheeler 553556 WrenchWheeler | 4.8 / 5 | 17,300 | 4.6 / 5 |
| LEXIVON LX-145 WrenchLEXIVON | 4.8 / 5 | 14,700 | 4.6 / 5 |
| MALCO MSHMLC WrenchMalco | 4.8 / 5 | 14,300 | 4.6 / 5 |
Similar wrenches from other brands
Questions about the Klein 66031
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
How many pieces come in the 66031 set?
12, per the listing.
How big is each piece?
3.1 inches long and 0.8 ounces, according to the spec sheet.
Is this a full-size wrench set?
The weight and length suggest a compact format rather than full-size wrenches, so confirm against your fastener size first.