Description: 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 Can be used for a long time 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 chuck for coolant thru tool applications Package Included 14 x ER20 ColletsMore Details