Tool, Prep Tool for LMR-400-LLPX and FBT-400 Crimp and Clamp Style Connectors with Built-In Debur ToolTool, Prep Tool for LMR 400 LLPX and FBT 400 Crimp and Clamp Style Connectors with Built In Debur Tool Product ID: CST 400 PX Tool, Prep Tool for LMR 400 LLPX and FBT 400 Crimp and Clamp Style Connectors with Built In Debur Tool Pasternacks CST 400 PX is a LMR 400 and FBT 400 Prep tool and one of many RF tools that we can ship same day to anywhere in the world. This CST 400 PX LMR 400 and FBT 400 Prep tool is available in 3. 1 length. Key