Astro Pneumatic Cut-Off Wheels 100PK CW3-100 Astro Pneumatic Cut-Off Wheels 100PK CW3-100 features abrasive wheels that are designed for cut-off applications involving angle iron, rebar, pipe and bar stock and can be used in cutting sheet metal, metal hardware or fasteners. Astro Pneumatic Cut-Off Wheels 100PK CW3-100 feature a 46 grit, 3” diameter and a 1/16” thickness and a 3/8” arbor hole that fits all brands of pneumatic cut-off tools.