Item Type: Tap Collet Chuck Holder Model: MT4-GT12-110L Material: 40CR Diameter of the Big End of the Cone: Approx. 31mm / 1.2in Interface: Approx. 19mm / 0.7in L1: Approx. 110mm / 4.3in L2: Approx. 120mm / 4.7in Tapping Range: M3-M16 Hardness: HRC48~52 Applicable Chucks: M3, M4, M5. M6 M8, M10, M12, M14, M16 Purpose: Used for clamping straight shank taps, used for tapping processing; Product Advantages: Industrial products, anti-overload protection, the tap will automatically slip when reaching a certain torsion to prevent the tap from breaking; it has the function of floating, telescopic and fast change Product Application: Widely used in CNC machining centers, drilling machines, lathes, CNC/milling machines, boring machines and tapping machines, etc. Package List 1 x Tap Collet Chuck Holder 1Accurate product specifications and bright appearance, high quality and long service life 2High accuracy, easy to load and unload, convenient and simple to replace the damaged one 3The tool holder can expand and contract, fully protect the tap and speed up work efficiency 4Using 40CR material, the quenching hardness is HRC48"52, sturdy and durable 5Widely used in CNC machining centers, drilling machines, lathes, CNC/milling machines, boring machines and tapping machines, etc.