This product is the Replacement Blade Cartridge for Universal Cable Stripping Tool (UST-500) and Coaxial Cable Stripping Tool (UST-125). This blade cartridge features the following:

Provides a 2-level strip for F, BNC, and RCA connector termination
High carbon steel blades last for over 5,000 strips
Cable stop on both sides of the cartridge ensures precise stripping without need to make adjustments
Cartridge is reversible for ambidextrous use
Compatible with all our UST Stripping Tools (except the UST-175 and UST-185)
Stripping action removes 1/4- of jacket and 5/16- of shield and dielectric, which exposes the center conductor