The RCBS Case Trimmer Collet #1 is a precision case-holding component designed for reloaders who need consistent, accurate case trimming. If you're running a manual or power case trimmer and want to secure cases reliably during the trimming process, this collet works like a draw collet on a lathe—gripping cases firmly and coaxially so they trim true to length every time. This is the foundation of repeatable handloading: if your cases aren't trimmed to spec, your rounds won't perform or feed predictably.

RCBS collets fit a wide variety of cartridge cases, so whether you're prepping rifle brass or handgun cases, there's likely a compatible collet for your caliber. Because collets are sold separately and come in different sizes, you'll want to check the RCBS Trimmer Collet compatibility chart to confirm which number matches your specific cases. It's a small step that saves frustration and ensures you get the right fit the first time.

This collet is designed to work with RCBS trimming systems, including the manual Trim Pro Case Trimmer and the powered Trim Pro-2 Case Trimmer, as well as other compatible RCBS equipment. If you're serious about case prep and want your trimmed brass to hold tight and cut clean, a quality collet is non-negotiable. RCBS collets are built to exacting standards—they'll hold concentricity and handle hundreds of cases without wear.

The RCBS Case Trimmer Collet #1 is a precision case-holding component designed for reloaders who need consistent, accurate case trimming. If you're running a manual or power case trimmer and want to secure cases reliably during the trimming process, this collet works like a draw collet on a lathe—gripping cases firmly and coaxially so they trim true to length every time. This is the foundation of repeatable handloading: if your cases aren't trimmed to spec, your rounds won't perform or feed predictably.

RCBS collets fit a wide variety of cartridge cases, so whether you're prepping rifle brass or handgun cases, there's likely a compatible collet for your caliber. Because collets are sold separately and come in different sizes, you'll want to check the RCBS Trimmer Collet compatibility chart to confirm which number matches your specific cases. It's a small step that saves frustration and ensures you get the right fit the first time.

This collet is designed to work with RCBS trimming systems, including the manual Trim Pro Case Trimmer and the powered Trim Pro-2 Case Trimmer, as well as other compatible RCBS equipment. If you're serious about case prep and want your trimmed brass to hold tight and cut clean, a quality collet is non-negotiable. RCBS collets are built to exacting standards—they'll hold concentricity and handle hundreds of cases without wear.