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Description: 12PC High Precision ER40 Collets Set Common Popular Size 1/8, 3/16, 1/4"; 5/16"; 3/8"; 1/2"; 5/8"; 3/4", 7/8", 1", 1-1/16, 1-1/8". Made of high grade spring steel Accuracy: 0.0003" or 5um Ground roughness is Ra0.4 Microns, plus overall fine polish Running True at High Speed turning Fit for all R8, morse tapper, CAT BT CNC ER40 chuck or holder Features: Special angled slots increase rigidity Better overall balance of tool holder assembly Protects tool holder from contaminants Use with any standard ER collet chucks for coolant-thru tool applications. Decent quality at reasonable price Pacage includes? 12PC ER40 Collets Set 1/8, 3/16, 1/4"; 5/16"; 3/8"; 1/2"; 5/8"; 3/4", 7/8", 1", 1-1/16, 1-1/8".