Reed Internal Pipe Cutters cut pipe from the inside: below floor level or in the ceiling in new construction, around pools, and for replacement of closet flanges. Heat-treated steel, saw-toothed blades on the IC1S, IC1SL and IC3/4SL make for fast cutting. The IC1A comes with an abrasive blade for areas where the blade may come in contact with concrete or other hard surfaces which would destroy a saw tooth blade. All internal pipe cutters fit in a standard 3 /8 in drill (not included). During use, flats on the larger cutters keep the cutter from slipping in the jaws of the drill while a lock washer on the smaller cutters keeps the blades from slipping. All saw toothed internal pipe cutter models cut plastic pipe aggressively and can cut wood for sink lugs. IC1SL and IC3/4SL feature an exclusive, adjustable guide that doubles as a depth gauge. The IC3/4SL is exclusive in its 3 /4 in pipe diameter.