The L.E. Wilson Case Holder Clamp is an alternative to holding the case holder down with your hand. All you need to do is set the Case Holder on the rails of the trimmer and then swing the clamp over the top. There is an adjustment on top of the clamp to increase or decrease pressure. Coated with a Bright Nickel Finish. The L.E. Wilson Case Trimmer is one of the best trimmers on the market. This stand helps to eliminate the problem of trying to find away to mount the trimmer to a reloading bench. Dimensions: 5-1/4" L x 1-3/4" W x 3" HNotes: This stand comes with screws to attach the base to the trimmer, but not to attach the base to a reloading work surface. The reloader will have to source their own screws for this purposeThe case trimmer pictured on top of the stand is not included it is a separate item #487924 (Standard Trimmer) or #454606 (Micrometer Case Trimmer)