This convenient quick-change tool post set will speed up your lathe operations. The T10166 17-Piece Quick Change Tool Post Set is case-hardened and coated with a black oxide finish for long life and repeatable accuracy. Having this set mounted to your lathe minimizes downtime looking for the accessories you need and keeps you turning out production work. Before mounting the 100-series tool post body into the T-slot of your compound rest, you will need to machine the plate underneath the tool post body to match the dimensions of the T-slot. The set comes with a piston-type mechanism and five tool holders including: turning holder, knurling/turning holder, parting tool holder, boring bar holder, and boring/turning holder. The T10166 instruction sheet was written by our U. Based Technical Documentation Department and is packed with useful information on how to assemble and maintain your set. For lathe swing: 9″-12″. Maximum tool bit size: 1/2. Tool post size: 100-Series. Number of holders: 5. 1/2″ Drill chuck with 3/4″ shank. 3/4 Boring bar/drill chuck holder. Two fine, two medium, and two coarse knurling wheels. Note: Not compatible with M1099/G0602/G0752 Series Lathes. The tool holders will not adjust low enough. Each set comes with a blank T-nut which requires machining to fit your lathe.