1、Fine Craftsmanship: With polished surfaces, fine craftsmanship, roughness > 0.08mm, strong, not easy to deform. 2、High Accuracy: The latest technology is used to create the body with an accuracy of 0.005mm, and the clamping is firm and tight. 3、Sturdy Durable: The inner cooling water outlet hole can make your drill bit more violent during processing, the whole is quenched, sturdy, and can be used for a long time. 4、Premium Materials: Made of high carbon steel, not easy to be damaged, the quality of inner hole grinding is guaranteed, high hardness, good corrosion resistance. 5、Firm Clamping: The tool holder is clamped at one time, the inside and outside are formed at one time, and the contact surfaces of the U drill is large. 1 x Milling Chuck Bracket1 x Fast Change Joint Item Type: Milling Chuck BracketMaterial: High Carbon SteelModel: MT3 SLN20Accuracy: 0.005mmRoughness: > 0.08mm