Item Type: Tapping Collet Set_x000D_Material: Alloy steel_x000D_Shank Model: BT40 GT12_x000D_Chuck Model: ISO GT12 M3, ISO GT12 M4, ISO GT12 M5, ISO GT12 M6, ISO GT12 M8, ISO GT12 M10, ISO GT12 M12_x000D_Tapping Range: M3-M16 1HIGH STRENGTH AND DURABLE: Tapping collet set adopt good quality material, strong and durable, possess high strength and long life, tapping range from M3?M16 2TRANSMIT POWER AND PROTECT: The end face of the collet casing is provided with a claw that engages with the main shaft of the machine tool, and the shank of the collet casing is provided with steel balls, springs and tighten screws that can not only transmit power to the tapping collet but also protect against overload 3EFFICIENT FAST CHANGE: Come with fast change, non overload protection function, reduce labor strength, very efficient 4AUTOMATIC SLIP TO PROTECT: When the tap reaches a certain torsion, will automatically slip, prevent the tap from breaking, protecting the workpiece and the tap, thus reducing the production cost 5WEAR AND CORROSION RESISTANT: Alloy steel material has high toughness, wear resistance, corrosion resistance, low and high temperature resistance 1 x Handle 7 x Chuck 2 x Key 1 x Wrench 1 x Storage Box