Industrial Hole Saw Kit - marketed by WL Fuller, is top-quality and will last through those tough jobs. This kit contains 15 plumbing and electrical sizes for pipe and conduit sizes up to 4 inches. Cutting diameters in this hole saw kit are 1 each of 3/4, 7/8, 1-1/8, 1-3/8, 1-1/2, 1-3/4, 2, 2-1/4, 2-1/2, 3, 3-1/4, 3-5/8, 3-3/4, 4-1/4, and 4-1/2 inches. This set includes arbors numbers WF58000001, WF58000002, and WF58000004 and extension WF58012000.