● 2 piece of same size in a set, and the V shape slot is in precision angle. ● After precision grinding, it can be used to test the concentricity of mandrel. ■ Feature: ● Material:SK2 ● Hardness:HRC56°±2 ● V shape slot precision within 0.005mm MCL-A2 MCL-A3 MCL-A4 MCL-A5 MCL-A6 MCL-A7 MCL-A8 MCL-A9 MCL-A10