Size - 5/32 Hexagon Head, 1/4 Hex Shank, 4 (100mm) total length. Material - Made of S2 alloy steel material with sandblasting finish, high hardness and durability, suitable for industrial use. Feature - The magnetic bit tip can hold the screw securely before installation and after removing the screw to improve efficiency. Usage - Can be used for electric screwdrivers, manual screwdrivers, electric drills, air drills, etc. Notice - Do not turn the screws with mismatched size to avoid damage to both the screw and the drill. Set Name 5-Piece Set Brand Name HARFINGTON Unit Count 1.0 Count Item Length 4 Inches Drive System Hex Finish Types Steel Manufacturer HARFINGTON Model Number hta220728hh0098 Material Type Alloy Steel Number of Pieces 5 Drive Bit Shank Style hex shank Manufacturer Part Number hta220728hh0098