Brief introductionBT APU SELF-FASTEN DRILL CHUCK, Application range: clip diameter: 0.5-16mm bit .Mechanical spindle and cutting tools and other accessories.High Precision BT shank Tool Holder ,balanced G6.3 or G2.5 For choose.BT Tool Holders for mechanical spindle and cutting tool and other accessory tool connection. Is a simple, popular spindle shank connection standard, mainly BT30 BT40 BT50... Etc.. Mold industry, and high-speed engraving machine, used more. Specifications1. Material:high quality steel.2. High precision,big grip force.3. BT40 Integrated Drill Chucks. 4. Integrated keyless drill chuck with BT mounted shank. 5. This integrated design can prevent drill chuck separate acceidently with arbor. Products advantages 1. General purpose high speed, high precision machining, cutting effect is good. 2. special coating surface treatment,improve the hardness and endurance of the surface,cleaness better,accuracy stable,surface 3. higher system accuracy. 4. High hardness, toughness and wear resisance, High thermo stability and high heat resistance