Features: Brand new and high quality Imported carbon steel material, high hardness, wear resistance, strong magnetic treatments and convenient use. The slot is maded standard technology, which has high coincidences and is suitable for different hand drills. High fit with screw, strong magnetic adsorption, stable and convenient operation. 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, furniture industry screw equipment. Specifications: Material:Carbon Steel Batch head length: Approx.75mm/2.95inches Size:Approx.185x130x40mm/7.28x5.12x1.57inches Package Includes: 36x Screwdriver Bit note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.