Item Type: Collet Chuck Holder Model: D25-GT12-110L Material: High carbon steel Purpose: Anti-overload protection to prevent the tap from breaking Taper: 7/24 Hardness: 48 Accuracy: 0.01mm Tapping Range: M3-M16 Tool Handle Length: Approx. 110mm / 4.3in Size of Chuck: Approx. 19mm / 0.7in Maximum Diameter of Tool Holder Taper: Approx. 25mm / 1in Extendable and Retractable Stroke: Approx. 15mm / 0.6in Adapter Chuck: GT12GT12BTC312G3 Package List 1 x Collet Chuck Holder 1Builtin spring, which can reduce wear, extend life, bring higher concentricity 2The product is a quick-change tap adaptor, have large compensation function 3Possess good toughness, strong abrasion resistance, large clamping force, anti-broken wire and anti-chaotic teeth 4Extendable and retractable two-way floating, effectively improving work efficiency 5Come with antioverload protection function to prevent the tap from breaking