Durable Material: It is made of high-strength steel material, very durable, firm and wear-resistant for us to use Special Design: Each screwdriver is designed in strict accordance with the principles of ergonomics, safe to use. Useful Function: Widely used power tools, electric screwdriver assembly, electronics industry, household appliances, precision instrument industry, furniture industry screw equipment Fine Workmanship: All bits are constructed of steel bits for extra strong durability and resistance to tool wear-out. Toughness is good, hard to rupture and wearproof Meaningful Tool: Suitable for installation in pneumatic screwdrivers, electric screwdriver, rechargeable drill, using the wind batch, Weight: 0.05732018812 Pounds, Manufacturer: Zambuph