3 Piece Drill bit cleaning kit used to return the DLTX carburetor passages to factory size. These extended drill bits are required for the long passages. If you are searching for the complete set for the Duplex Carburetors, consider PN: JJCTK9. Over the years, cast iron swells in the presence of moisture. Drilling the passages is the only way to correct this damage and return the idle passages to healthy operation. These drill bits have been chosen specifically for this kit. We use these same drill bits in our professional shop and normally get over 100 rebuilds from each drill. We have used other bits with poor performance. This is a MUST for rebuilding the Marvel Shebler DLTX carburetors used on 2 cylinder John Deere tractors . Please check out our other kits for additional service tools for these carburetors. DLTX Tools: JJCT8, JJCT9, JJCT10, JJCT11, JJCT12, JJCT13, JJCT14, JJCT15, JJCT16, JJCT17, JJCT18, JJCT26 DLTX Tool Kits, JJCTK1, JJCTK2, JJCTK3, JJCTK4, JJCTK5, JJCTK6, JJCTK7, JJCTK8, JJCTK9