Little Crow Trimmers The WFT Rifle Brass Trimmer was developed as a precision case trimmer, built to last a lifetime. The WFT products trim bottleneck cartridge brass only. Our Case Trimmers are made to work with Full Length Sized Cases. Our case trimmers use a power source that most people already own – a cordless or electric drill. Once adjusted to the user’s preference, it’s simply a matter of chucking it up in a drill and feeding cases in by hand. Order yours now because everyone loves trimming brass.