Klein 646-3/8M Screwdriver
- Screwdriver
- 1
- 0.3 ounces
- 9.7 × 2 × 2 inches
A single, lightweight Klein screwdriver worth buying once you've confirmed the exact tip type matches your specific job.
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How it ranks among the 158 screwdrivers we track
4.7★ across 368 Amazon ratings, Bayesian-smoothed toward the category average.
368 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
Modest tracked demand 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 158 screwdrivers we track - how the scorecard works · full screwdrivers 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 646-3/8M is a single piece screwdriver weighing just 0.02 pounds, with the 3/8 designation in its model number pointing to its tip or shank size.
This listing includes minimal spec data beyond weight, overall dimensions, and piece count, so buyers should confirm the exact tip type, flathead, Phillips, or nut driver style, from Klein's own product page before ordering, since the model number alone doesn't spell that out here.
- Klein brand
- Model 646-3/8M
- 0.02 pound weight
- Single piece
Who it's for
Fits anyone needing a single Klein branded screwdriver in this size who doesn't require a set. Not useful if you're shopping for a multi piece screwdriver kit, since this is a single unit.
Strengths and trade-offs
Drawn from this product's published specifications.
- Lightweight single-piece design
- Klein brand reliability
- Strong 4.7 star rating across 368 reviews
- Exact tip type not specified in this data
- Sold as a single piece, not a set
Performance notes
At 0.02 pounds this is an extremely light hand tool, consistent with a single small screwdriver rather than a heavy duty driver. Overall dimensions of 9.75 by 2 by 2 inches fit a standard single handle screwdriver profile.
Specifications
| Brand | KLEIN |
|---|---|
| Model | 646-3/8M |
| Pieces | 1 |
| Item Weight | 0.3 ounces |
| Dimensions | 9.7 × 2 × 2 inches |
Other KLEIN screwdrivers
How it compares
This product against the closest alternatives we track in screwdrivers.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Klein 646-3/8M ScrewdriverThis product | 4.7 / 5 | 368 | 3.8 / 5 |
| JOREST 40Pcs Small Precision Screwdriver Set with Torx Triwing PhillipsJOREST | 4.7 / 5 | 25,021 | 4.6 / 5 |
| Amartisan wwer ScrewdriverAmartisan | 4.6 / 5 | 12,513 | 4.6 / 5 |
| AXTH 25-IN-1 ScrewdriverAXTH | 4.6 / 5 | 4,763 | 4.5 / 5 |
| VESSEL 220W-3 ScrewdriverVESSEL | 4.7 / 5 | 6,242 | 4.5 / 5 |
Similar screwdrivers from other brands
Questions about the KLEIN 646-3/8M
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
Is the Klein 646-3/8M sold as a set?
No, this listing shows it as a single piece.
How much does the Klein 646-3/8M weigh?
It weighs 0.02 pounds.
What does the 3/8 in the model number refer to?
It corresponds to the tip or shank size indicated in Klein's model naming.