Heavy duty 3pc tool rest set that enables you to position your chisel close to your work-piece to eliminate vibration while turning. Great for turning a bowl; inside hollowing and exterior wood removal. Post on all three tool rests is 25mm Diameter and 4-3/8" Long. Includes (1) 12" Straight with 3/4" Diameter Bar, (1) 5" Arc with 1. 25" x 3/16" Bar, and (1) 8" Arc with 1-1/4" x 3/8" Bar. Check the your lathe's tool rest holder for compatibility; 1" = 25. 4mm; 0.992126 = 25.2mm; 0.984252" = 25mm.