VEVOR 5" Ball Vise 34 PC Attachments Engraving Block Vise Jewelry Engraving Block Setting Jewelry with Pins and Rubber Base (34PC Attachments) Ball vise diameter: 5/ 130MM, Jaw width: 2.5/64MM; Jaw height: 1.5/ 38MM; Max opening: 3"/76MM Engraving Block is a double ball bearing system for smooth rotation without looseness or wear inside This ball vise engraving is made of solid stainless steel with rubber base Comes with a brake which allows you to control the rotational resistance The black jaws and satin finish save your eyes from glare and strain