Item Type: Collet Chuck Holder_x000D_ Model: MT2-GT12-110L_x000D_ Material: High speed steel_x000D_ Tool Handle Hardness: 58-60 degrees_x000D_ Accuracy: 0.002mm to 0.008mm_x000D_ Purpose: Anti-overload protection, stop tap breakage_x000D_ Advantages: Anti-overload protection, the tap will automatically slip when reaching a certain torsion to prevent the tap from breaking; has the functions of floating, telescopic and quick-changing_x000D_ Function: Used for clamping straight shank taps, used for tapping processing_x000D_ Application: Used for tapping processing; widely used in CNC machining centers, drilling machines, lathes, CNC/milling machines, boring machines and tapping machine tools, etc._x000D_ Tool Handle Length: Approx. 110mm / 4.3in_x000D_ Size of Chuck: Approx. 20mm / 0.8in_x000D_ Maximum Diameter of Tool Holder Taper: Approx. 19mm / 0.7in_x000D_ Applicable Chuck: GT12GT12BTC312G3_x000D_ Interface Location:_x000D_ GT12 Size: Approx. 19mm / 0.7in