Klein Tools 646-3/8M Magnetic Nut Driver 3/8 Inch
- Head Style: Hex
- Material Type: Alloy Steel, Rubber
- Item Weight: 0.02 pounds
- Manufacturer Warranty Description: 1 year manufacturer
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A single, lightweight Klein screwdriver worth buying once you've confirmed the exact tip type matches your specific job.
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ASIN: B000MKKD78Model: 646-3/8MCategory: Screwdrivers
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.
Pros and cons
- Lightweight single-piece design
- Klein brand reliability
- 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 |
| Dimensions & fit | |
| Item Weight | 0.02 poundslower than 99% of 112 screwdrivers |
| Item Dimensions | 9.7 × 2 × 2 inches |
| Head Size | 3/8 |
| Construction & materials | |
| Material Type | Alloy Steel, Rubber |
| Color | Factory |
| Included components | |
| Unit Count | 1 |
| Included Components | Tools & Accessories |
| Warranty & support | |
| Manufacturer Warranty Description | 1 year manufacturer |
| Other details | |
| Head Style | Hex |
| Number Of Items | 1 |
| Recommended Uses For Product | Construction, Home Improvement |
| Special Feature | Magnetic Tip |
| Item Type Name | Klein Tools 646-3/8M Magnetic Tip Nut Driver, 3/8-Inch With 6-Inch Hollow Shank |
Closest rivals on specs
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Wiha 26547 Precision Nut Driver 3/16 Inch- Item Weight 0.02 vs 0.05 pounds (-60%)
Frequently asked questions
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.