Discover The Groz Arbor Drill Chuck B18 Mt2 G-18/M2 – Your Go-To Solution For Reliable Performance In Workshops And Homes. Drill Chuck Arbors Are Used To Mount A Drill Chuck Or Any Other Tool Which Has A Female Taper Shank Onto A Machine Such As A Drilling Machine Which Has A Female Taper Shank Socket In Its Workhead Manufactured From Selected Case Hardened Hi-Tensile Steel (20 Mncr5/Sae 8620), All Arbors Are Case Hardened 54-58 Hrc For Increased Resistance To Wear Precision Grinding To Very Close Tolerance With Concentricity Controlled To Within 0.0004 Inch (10Microns) And Accurately Gauged Self-Locking Tapers Ensure Close Tolerance Fit Specification: Arbor Type: Jacobs Taper – Din 238 Shank Mount: Morse Taper Chuck Mount: B Taper Designed To Meet The Demands Of Local Conditions, This Product Offers Lasting Durability And Efficiency.