The Hull Vise is a high-quality machined tool that holds shells in place with an adjustable quick-release locking mechanism while you perform loading operations. The Hull Vise comes set up for 12 through 20-gauge. Accessory gauge blocks are easily installed for 8-10-gauge and 28ga. -.410-bore shotshells, both sold separately. Made in the USA of steel machinined components and billetted aluminum, guaranteed quality. Rollcrimped shotshells and specialized handload procedures are easy to manage when the shells are upright and held in place. Like any great tool, the Hull Vise saves time, makes loading easier and helps you make better shotshells.