Used to cut holes in stainless steel and other materials up to 3/16 in. thick, 628 and 648 Carbide Cutter sets each come with 6 cutter sizes from 7/8–2 ½ in. Split-point, cobalt-steel pilot drill eliminates walking and fosters accelerated penetration, while tungsten-carbide teeth accelerate cutting of round, burr-free holes. While 628 Carbide Cutter set has built-in arbor on each cutter, 648 set includes separate cutters and 2 quick change arbors. Flange stop helps prevent over-drilling.