The BLACK RBC-6590 replacement blade cartridge works with the yellow CPT-series and Super CPT-series coax cable strippers on RG6 and RG59 cable. It cuts braid and dielectric to .25" (6.4mm) and exposes the center conductor to .25" (6.4mm) minimum. The hardened, tool-steel blades ensure optimum performance over a long life. Each cartridge can prepare 2500 to 5000 cables, depending on braid coverage. The cartridge snaps easily into place.