Roto Zip CN1 Replacement Collet and Nut Kit Works with all RotoZip spiral saw tools and Drywall routers Keep your RotoZip tool running at full capacity with replacement collets Replacement collet for all bit sizes Kit Includes: 3 collets (1/8-Inch, 5/32-Inch, 1/4-Inch) and nut Replacement collets for 1/8-Inch, 5/32-Inch, 1/4-Inch bits