LENOX Tools Replacement Blade for Plastic Pipe Cutters, R1 (12127R1B) Style:R1Replacement blade for 12123R1 plastic tubing cutter. Straight cuts are easier, because the serrated stainless steel blade requires less force to make a cut, leaving a flush end. Cuts up to 1 1/4-inch nominal (1 5/8-inch max. OD). LENOX Tools Replacement Blade for Plastic Pipe Cutters, R1 (12127R1B).