The RIDGID® Model HC450 is engineered for continuous 1?4" (6 mm) to 4 3?4" (120 mm) hole cutting in and up to 8" (203 mm) diameter steel unpressurized pipe. The built-in level ensures line up for multiple holes when branching lines using Mechanical T®, Vic-O-Let™ fittings or welded saddles. No off-the-shelf drill-based hole cutter compares in performance or durability to the rugged purposed-built Model 450.