Machine Clamping Kit, Machinist, Number of Pieces 52, Slot Size 1/2 in, For Use With Drilling Machines, Lathes, Milling Machines, Includes (6) Step Blocks, Material - Machining Steel, Application For Fixing Each Kind of Working Piece on Machining Table, Features All the Blocks, Bolts, Nuts and Hold-Downs are Case Hardened.