Features 1、The accuracy of the body is 0.01mm, the concentricity is high, the processing effect is good, the efficiency is improved, and the service life of the tool is prolonged 2、All tool holders contain high-accuracy ball guide sleeves, which reduce wear and have a higher concentricity, which can protect the product from excessively fast feeding and retraction of the product due to tapping, breaking of the tap and deformation under pressure control 3、The inner hole is finely ground, the inner hole is bright, and it is ground by the self-developed grinding stone 4、Advanced vacuum quenching furnace can achieve carbonitriding, improve the hardness of the tool holder and the accuracy of the body 5、Can improve tap life, reduce machine tool parameter requirements, improve thread accuracy and surface quality, torsion overload protection function 6、Micro‑compensation synchronous tapping, improving processing efficiency, optimization of extrusion taps, higher suitable for processing fine teeth and inch teeth Specification Model: BT30-GT12-125L Material: High speed steel Purpose: CNC machining center tapping tool holder Tool Handle Length: Approx. 125mm / 4.9in Size of Chuck: Approx. 19mm / 0.7in Maximum Diameter of Handle Taper: Approx. 31mm / 1.2in Outer Diameter: Approx. 45mm / 1.8in Tapping Ability: M3-M16 Applicable Chuck: GT12 TC312 G3 Function: 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. Package List 1 x Tapping Holder