5" Engraving Block Ball Vise Setting Jewelry Rubber Base With 30 pcs Attachment The standard block is of outstanding quality and value, made of solid stainless steel There is a double ball bearing system for smooth rotation without looseness or wear inside 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 Ball diameter: 5" ; Jaw width: 2.5" ; Jaw height: 1.5" ; Max opening: 3"