Description:1/8 9/64 11/64 5/32 3/16 7/32 15/65 9/32 5/16 11/32 3/8 13/32 7/16 1/2 Spring Collets Set For CNC Engraving Milling Lathe ToolSpecification:Model: ER20Material: Spring SteelPrecision: <0.015Gripping Range: 1/8", 9/64", 11/64", 5/32", 3/16", 7/32", 15/65", 9/32", 5/16", 11/32", 3/8", 13/32", 7/16", 1/2"Upper Diameter: 28 mmBottom Diameter: 25 mmHeight: 34 mmT.I.R.: 0.0003" or 5um.Suitable For: Boring, milling, drilling, tapping, engraving, CNC, spindle machines, and other processingGround roughness is Ra0.4 Microns, plus overall fine polish.Quantity: 14pcs/SetFeatures:1. Durable and practical.2. Special angled slots increase rigidity.3. Protects tool holder from contaminants.4. Better overall balance of tool holder assembly.5. Use with any standard ER collet chucks for coolant-thru tool applications.Package Included:14 x ER20 ColletsMore Details