zvd step drill bit, 3pcs 4 12 20 32mm double slot conical step countersink drill bit with hss titanium coating,hexagon shank,automatic center punch

multi size 1pc 15 step drill bit 4 32mm , 1pc 9 step drill bit 4 20mm , 1pc 13 step drill bit 4 12mm . three sizes are available to meet your needs. the package includes a nylon bag. premium materials classic high speed steel, titanium coating on the surface, proven performance and durability in dr