... 0.015mm ,sk high speed 2,collet .precision 0.015mm 3Made of special material steel:65mn Specifications1,High accuracy of er ... collets 0.015mm ,sk high speed 2,collet .precision 0.015mm 3Made ... :65Mn 2.Power clamping ability,high accuracy 3.USed for boring,milling,drilling,etcwelcome inquiring more information SK high speed collet