No time wasted with shims. All working parts hardened and precision ground. Piston type tool post are precision engineered to assure repeatability accuracy. Piston type tool post Have the Maximum rigidity to get the chatter free performance. Suitable for lathe center height 0.6 – 1.75″ (top compound surface to lathe center line), such as: South Bend 9″ & 10″, Atlas 10 & 12″, Delta 10 &11 Nardini TT1000 & TT1200 and many other import lathes. Whole set includes one each of: 250-100 Piston Type Tool Post.