20PCS 4-Inch S2 Magnetic Hex Bit Set – Metric & SAE Impact Drill Bits
Working with recessed Allen fasteners can be difficult when standard-length bits do not provide enough reach. The 20PCS 4-Inch Magnetic Hex Bit Set is designed to provide extra working clearance for furniture assembly, home repairs, garage maintenance and workshop projects. Featuring S2 steel construction, magnetic tips, 1/4-inch hex shanks and both Metric and SAE sizes, this set offers a versatile selection of long hex bits for compatible drills and impact drivers.
20-Piece Long Magnetic Hex Bit Set – Metric and SAE
- 20-piece magnetic hex bit assortment
- 4-inch overall bit length
- 10 Metric and 10 SAE sizes
- S2 steel construction, as described by the seller
- Magnetic tips for compatible steel fasteners
- CNC-machined tips for accurate sizing
- Anti-break torsion zone designed to absorb peak torque
- Manganese phosphate surface finish
- Standard 1/4-inch hex shanks
- Two size-marked storage holders for organisation
Product Overview
Hex fasteners are commonly used in furniture, machinery, equipment and general DIY applications. Having the correct Allen bit size is important for achieving a secure fit and reducing the risk of damaging the fastener.
This 20-piece hex bit set includes a selection of Metric and SAE sizes in a longer 4-inch format. The additional length is intended to provide more clearance around recessed fasteners and help reach areas where shorter bits may be difficult to use.
According to the product description, the bits are manufactured from hardened S2 steel and feature magnetic tips, CNC-machined ends and an anti-break torsion zone. The set also includes two labelled storage holders to help keep the different sizes organised.
Key Features of the 20PCS Magnetic Hex Bit Set
1. Extended 4-Inch Overall Length
Each bit has an advertised overall length of 4 inches, providing additional reach compared with many standard short hex bits.
The longer design can help keep the drill chuck or bit holder away from nearby surfaces while working on recessed fasteners, furniture fittings and other hard-to-reach areas.
2. 20 Metric and SAE Sizes
The set includes 10 Metric sizes and 10 SAE sizes, offering a broad selection for different hex fasteners. Having both measurement systems in one set can be useful when working on equipment, furniture and projects that use different fastener standards.
3. S2 Steel Construction
The product description identifies S2 steel as the material used for the bits. S2 tool steel is commonly used in screwdriver and impact bit applications.
The seller describes the bits as hardened for demanding driving tasks. Actual service life depends on the fastener material, selected bit size, tool settings and working conditions.
4. Magnetic Tips for Convenient Fastener Positioning
The magnetic tips are designed to help hold compatible steel fasteners in position while starting or driving them. This can make certain assembly and repair tasks more convenient, especially when working in confined spaces.
Magnetic attraction varies depending on the fastener material and design. Always make sure the bit is correctly seated in the fastener before applying torque.
5. Anti-Break Torsion Zone
According to the seller, the bits feature an anti-break torsion zone designed to absorb peak torque during use. This design is intended to help manage the stresses created when driving fasteners with compatible power tools.
It does not make the bits unbreakable. Use the correct size, suitable tool settings and appropriate torque for the fastener.
6. Manganese Phosphate Finish
The bits feature an advertised manganese phosphate surface finish intended to help resist rust and corrosion. Keeping the bits clean and dry after use can also help maintain their condition.
7. Standard 1/4-Inch Hex Shanks
The 1/4-inch hex shanks are designed for compatible drills, impact drivers and hand bit drivers that accept this standard shank format.
Check your tool’s holder specifications before use, particularly if it has a specialised chuck or bit-retention system.
8. Two Organised Storage Holders
The set includes two size-marked holders to separate the Metric and SAE groups. This makes it easier to identify the required size and keep the bits organised between projects.
Complete Metric Hex Bit Size List
The following 10 Metric sizes are included:
| No. | Metric Size | Quantity |
|---|---|---|
| 1 | 1.5 mm | 1 bit |
| 2 | 2 mm | 1 bit |
| 3 | 2.5 mm | 1 bit |
| 4 | 3 mm | 1 bit |
| 5 | 3.5 mm | 1 bit |
| 6 | 4 mm | 1 bit |
| 7 | 5 mm | 1 bit |
| 8 | 6 mm | 1 bit |
| 9 | 7 mm | 1 bit |
| 10 | 8 mm | 1 bit |
Complete SAE Hex Bit Size List
The following 10 SAE sizes are also included:
| No. | SAE Size | Quantity |
|---|---|---|
| 1 | 5/64 inch | 1 bit |
| 2 | 3/32 inch | 1 bit |
| 3 | 7/64 inch | 1 bit |
| 4 | 1/8 inch | 1 bit |
| 5 | 9/64 inch | 1 bit |
| 6 | 5/32 inch | 1 bit |
| 7 | 3/16 inch | 1 bit |
| 8 | 7/32 inch | 1 bit |
| 9 | 1/4 inch | 1 bit |
| 10 | 5/16 inch | 1 bit |
