b"SMOOTHCollet Selection Guidelines:Collets are available individually or in kitsCollet series is determined by the toolholder4.ER-taper size (8, 11, 16, 25, 32, 40)Match the collet bore diameter to thecutting tool shank diameterSMOOTHSMOOTH5. 6. 1. 5-Piece ER16 Straight Bore Sealed Collet Set | 2. 7-Piece ER16 Tap Collet Set | 3. ER Straight Bore Collet Kits; ER16, ER25, and ER32 4. 18-Piece ER32 Straight Bore Collet Set | 5. 15-Piece ER25 Straight Bore Collet Set | 6. 10-Piece ER16 Straight Bore Collet SetGreat quality for the price!This set covers everything I need to run a few machines in my shop. I don't have to search around anymore for the right collet sizes as I need them. The runout on these is pretty good too. Can't beat it for the price.Nathan Olsen 05/07/2023TAPReceive Free Next-Day Delivery with Winners Circle| 31"