Features: 1Corrosion Resistance: The overall use of great steel is more durable and not easy to damage, bore grinding quality assurance, great corrosion resistance. 2Polished Exterior: Exquisite technology, the exterior is polished exterior, roughness >0.08mm, make the exterior more light knot high hardness. 3Safe and Sturdy: This chuck holder is made of high carbon steel material, exquisite technology, safe and sturdy, no harm to users, can do long term use. 4High Accuracy: The latest technology is suitable to build the body accuracy of 0.005mm, clamping steady and tight, the tool shank is installed in one moment inside and outside, and the contact exterior is large. 5Stable and Powerful: Internal cooling water outlet hole, when processing can be internal water to make your drill more powerful and more stable to use. Package included: 1 x MorseTaperColletChuckHolder 1 x Fast Change Connector