The Area 419 Billet Loading block is machined from 6061-T6 Aluminum with a clear anodized finish. Dimensions are 9.5" x 4" x 5/8" . Holes are 0.500" deep and are a tight fit around the case to prevent tipping over. Hole bottoms have a small "divot"in the very center to catch powder kernels and prevent any possible accidents with primers. Features rubber pads on the bottom to keep from sliding around.