Steelex M1091 Boring Bar Set R-8, 18-Piece 2-Inch Boring Head; Wooden stand included R-8 Shank; 7/8 Inch by 20 TPI Mounting Threads 9 Carbide tipped boring bars; 1/2-Inch shanks 2 Facing Tools with 3/16-Inch square cutting tools Dial graduated in .001-Inch; .050-Inch per revolution; .025-Inch actual motion