Clamping Kit Machinist Number of Pieces 52 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. Racks Can Be Bolted to the Wall or Side of Machine for Easy Access Finish - Machining Black Oxide