Aluminum stacker.The overall length is 3 5/8″, wide at the base is 1 1/2″. the flared top opening is 1 3/16″, and the inside diameter of the removable tube is .845″. This is the ideal stacker to tie large hair bugs for bass, pike, snook, etc. as well as stack bucktail. This replaces A.K. Best’s magnum stacker which is no longer being made. Item# 2084