If you already have a Revolution Vise, then you can change out the vise head to one of the other two available options without the expense of a whole new vise. Hook size ranges are - regular head: sizes 22 to 1/0; big game head: size 22 to 5/0; stainless steel head: sizes 32 to 2. Requires a Revolution stem and body, not compatible with Medallion Vise stem and swivel.