Fit all R8, morse tapper, CAT, BT, CNC, ER20, chuck or holder. We carry high quality collets, with certificate in each set. 0.008mm≈0.0003". Made from alloy spring steel and hardened to HRC 44-48. Hole Dia: 1/16" 3/32" 1/8" 3/16" 7/32" 1/4" 5/16" 3/8" 7/16" 1/2".
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