Features Made of high quality and durable steel, a material commonly used in hardware. The screwdriver bits have magnetism and would attract screws and hold the screws tightly. With 1/4 inch hex shank, they are widely used on electric screwdrivers, hand screwdrivers, electric drills, etc. This set includes 3 types of slotted screwdriver bits, PH1, PH2 of different sizes that will meet your basic needs. These are great bits to have in your tool box and you won't have to worry about not having the right screwdriver again. Specification: Material: Steel Length: 100 mm (3.93 inches). Hex Shank: 1/4" Magnetism: Yes Type: SL6, SL5, SL4, SL3 PH2 diameter: 6 mm, 5 mm, 4.5 mm, 4 mm. PH1 diameter: 4 mm, 3 mm Features: The screwdriver bits have magnetism and would attract screws and hold the screws tightly. With 1/4 inch hex shank, they are widely used on electric screwdrivers, hand screwdrivers, electric drills, etc. This set includes 3 types of slotted screwdriver bits, PH1, PH2 of different sizes that will meet your basic needs. Made of high quality and durable steel, a material commonly used in hardware. These are great bits to have in your tool box and you won't have to worry about not having the right screwdriver again. Package includes: 10 Screwdriver Bits Package List