UT-RB-HD are the only heavy-duty replacement blades for the DX Engineering UT-8213 and UT-808X Coaxial Cable Prep Tools. Since these tools are supplied with these top-quality tool steel blades, it takes a lot of coaxial cable prep jobs to wear out the original set. We have tools that have actually made over a hundred cuts. Are you ready to change yours because they might be getting a little dull? Would you like to have a spare set on hand? DX Engineering Coax Prep Tool Replacement Blades are available here, to bring your cable prep tool back to peak performance. Note: Remove the hex socket cap screws that mount the tool steel blades in your UT-8213 or UT-808X tool with your 7/64 in. hex drive. The replacement blades, as with the originals, are automatically positioned when properly mounted.