Morse, CTS10 (166041), 5/8" (16mm) diameter, carbide tipped hole cutter is designed for cutting precision holes in sheet metal applications, such as control panels and electrical boxes. Ground tooth profile provides clean, fast cuts. Step center pilot drill reduces "break through" impact. Sholdered cutter body prevents pass through, protecting electrical components at shallow depths. Ejector spring aids in slug removal. One (1) cutter per box. Replacement parts, CTSP (166010) pilot drill and CTSS (166027) ejector spring.