Features: The screwdriver bits are made of S2 high quality steel material with heat treatment-. HRC60-62 strong hardness, good toughness- and wear resistance. The screwdriver bits are 100mm/4inch long, suit for poket hole jig woodworking. Magnetic heads can firmly fix screws, protect both screws and bits. Application: 1/4" 6.35mm hex shank fit for electric screwdrivers, hand screwdrivers, electric drills, air- drills etc Specifications: Name: SQ2 Square Screwdriver Bits Material: S2 Specification: SQ2 Surface-treatment: sand blasting Length: 100mm Handle type: 1/4 hexagonal handle Hardness: HRC60-62 Weight: 215g Quantity: 10PCS Package Includes: 1Set SQ2 Square Screwdriver Bits note: No retail package. Please allow 0-1cm error due to manual measurement. please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you.