Features (Good concentricity)Designed for 1/4 inch hex shank bits. Good concentricity (Hold bits securely)Extra-strength magnet holds bits securely (Prevent rust)The surface is phosphatized to prevent rust (Magnetic link rod)High quality connection rod, magnetic link rod (Suitable for screwdrivers)Suitable for pneumatic screw drivers, electric drills, electric screwdrivers, screwdrivers Description: The extension holder is designed for 1/4" hex shank bits, can be used for pneumatic screw drivers, electric drills, electric screwdrivers. It is strong magnetic and anti-rust. Features: (Good concentricity)Designed for 1/4 inch hex shank bits. Good concentricity (Hold bits securely)Extra-strength magnet holds bits securely (Prevent rust)The surface is phosphatized to prevent rust (Magnetic link rod)High quality connection rod, magnetic link rod (Suitable for screwdrivers)Suitable for pneumatic screw drivers, electric drills, electric screwdrivers, screwdrivers Specifications: Materiel: Carbon steel Length: About 60 mm / 2.36" Hexagonal Size: 1/4" Color: Grey Quantity: 10 pcs per bag Weight: 202g(approx.) Package includes: 10 x Screwdriver Bit Holder Note: Please allow 1-3mm error due to manual measurement. Thanks for your understanding. Package List