Features: 1.It was made of high-strength S2 alloy steel, very durable. 2.Toughne is good, hard to rupture and wearproof. 3.Magnetic bits, in the installation can easily absorb screws. 4.Suitable for installation in electric drill, electric screwdriver,rechargeable drill. 5.Widely used power tools, household appliances, precision instruments industry, furniture industry. Specifications: Material:S2 alloy steel Type of shank: 6.35mm / 1/4 inch hex. Size:Size: T5, T6, T7, T8, T9, T10, T15, T20, T25, T27, T30, T40. Overall length:50mm/75mm/100mm Package Include: 1 pc Drill bit storage rack or 12pcs 50mm*T5/6/7/8/9/10/15/20/25/27/30/40 0r 11pcs 75mm*T6/7/8/9/10/15/20/25/30/35/40 or 11pcs 100mm*T6/7/8/9/10/15/20/25/30/35/40 or Set 1:50mm*T5/6/7/8/9/10/15/20/25/27/30/40+1pc Drill bit storage rack or Set 2:75mm*T6/7/8/9/10/15/20/25/30/35/40+1pc Drill bit storage rack or Set 3:100mm*T6/7/8/9/10/15/20/25/30/35/40+1pc Drill bit storage rack Note: Dear friend, thank you for ordering in our store. If you have any questions after receiving the product, please contact us before the bad review, give us a little time to understand the details of the problem and the reason, please rest aured, we will do our best to help you solve the problem you encou