Features: High-toughness and strong,deliver a tighter fit and less cam-out High quality nickel plating surface- treatment-, super anti-rust, long lasting and durable Heat treated, durability, has high hardness, not easy to wear. Fit for electric drills with speed regulating device, electric screwdrivers, hand screwdrivers.Please do not use drill bits on pneumatic tools, air dills, and the electric drill without speed regulation. A long lifetime- of the drill bit is reached due to its durable construction and superior technology. Magnetic tips and arbitrary choice length, which helps to keep nuts and bolts stuck to them. Can improve your work efficiency. Specifications: Item：Magnetic Batch Heads Tip：Cross Size:approx 25-150mm/098x5.9in Color：As Pictures Material:S2 Quantity:2PCS/3PCS/4PCS/5PCS/7PCS (Optional) 2PCS Package Types：50 65MM/127 150MM/ 25 50MM 3PCS Package Types: 65 70 90MM/ 65 70 90MM/ 50 65 70MM 4PCS Package Types: 50 65 70 90MM/ 65 70 90 127MM/ 70 90 127 150MM 5PCS Package Types: :25 50 65 70 90MM/ 25 65 70 90 127MM / 25 70 90 127 150MM 7PCS Package Types: 25 50 65 70 90 127 150MM Package Includes: 1 Set x Hex-Head Screwdriver Bits note: No retail package. Please allow 0-1cm error due to manual measurement. please 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