Feature: It is made of high-strength CRV Steel, very durable, firm and wear-resistant for us to use. Magnetic bits, in the installation can easily absorb screws. Toughness is good, hard to rupture and wearproof. Suitable for installation in pneumatic screwdrivers, electric screwdriver, rechargeable drill, using the wind batch. Widely used power tools, electric screwdriver assembly, electronics industry, household appliances, precision instruments industry, furniture industry screw equipment. Screwdriver Bits only, other accessories demo in the picture is not included Specifications: Item Type: Screwdriver Bits Material: CR-V Surface Electroplating Length: 28mm/1.1in Handle Diameter: 4mm/0.1in Specification: T3, T4, T5, T6, T7, T8, T9, T10, T15, T20 Transition: 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. pls 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 Size: 28*4mm Delivery color: as pictured Shipping Quantity: 10 pieces/set