Features 1、Built‑in spring can help to reduce wear, extend life, bring higher concentricity 2、The product is a quick‑change tap adaptor, possess large compensation function 3、Come with good toughness, strong abrasion resistance, large clamping force, anti‑broken wire and anti‑chaotic teeth 4、Two‑way floating of extendable and retractable, effectively improving work efficiency 5、The product have anti‑overload protection function to prevent the tap from breaking Specification Item Type: Collet Chuck Holder Model: D20-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. 20mm / 0.8in Extendable and Retractable Stroke: Approx. ±15mm / 0.6in Adapter Chuck: GT12,GT12B,TC312,G3 Package List 1 x Collet Chuck Holder