Sanitary Stainless Steel Spools with Tri-Clamp Ends Each sanitary spool is made from 304 stainless steel with a brushed polished OD with a 15Ra inside finish. Each spool includes tri-clamp ends for use in control equipment for the food & beverage, dairy, cosmetic and pharmaceutical processing industries. Multiple pipe sizes and lengths are available, such as 1", 1.5" and 2".