Item Type: Tapping Tool Holder_x000D_Model: BT40-GT12_x000D_Material: High Speed Steel_x000D_Purpose: CNC machining center tapping tool holder_x000D_Tool Handle Length: Approx. 110mm / 4.3in_x000D_Chuck Size: Approx. 19mm / 0.7in_x000D_Handle Taper Maximum Diameter: Approx. 44.45mm / 1.8in_x000D_Applicable Chuck: GT12 TC312 G3_x000D_Application: Used for clamping during thread processing. The telescopic tapping tool holder can shrink back and forth by 5mm through the internal protection mechanism, which can protect the tap when it is overloaded and stopped. 1The tapping tool handle has an accuracy of 0.01mm, with high concentricity, good processing effect, and improved machining efficiency. 2The tool holder contains a high?accuracy ball guide sleeve to reduce wear and prevent the tap from breaking and deforming. 3When processing the thread, the tapping tool holder can be extended and contracted to protect the tap when it is overloaded and stopped. 4Made of high?speed steel and quenched, it has good elasticity, wear resistance and stable performance. 5Floating and telescoping function, make slight synchronous expansion and contraction compensation during the tapping process, and increase the service life of the tap.1 x Tapping Tool Holder