The specially engineered patent-pending design of SoluGap® provides an even, pre-measured 1/16" minimum gap required by ANSI 31.1, Section III, ASME, US Navy & Military Codes. SoluGap® has three tabbed edges designed to secure the spacer in place, even when the socket is placed sideways or upside down. Unlike metal spacers that must be inventoried in many varieties, SoluGap® is made of Aquasol® water soluble board, a material that is compatible with any metal. SoluGap® dissolves completely and rapidly in most liquids.