Pepetools newest line of Gold Standard Ring Mandrels ensure 100% match between any Pepertools Gold Standard Product. This means each Gold Standard Mandrel, Steel and Aluminum, and Gold Standard Ring sizer is assured to have 100% match. Each mandrel is inspected with a laser scan micrometer ensuring accuracy as well as verified with a ring sizer manually. Pepetools Gold Standard Aluminum Ring Mandrel, lighter in weight, may be used to measure customer rings at the sales counter. The Aluminum, aircraft quality and calibrated are 100% matched with the Gold Standard steel mandrels and Gold Standard Ring Sizers. This Aluminum Mandrel has no groove . Each Mandrel is packaged in a reusable plastic tube for easy transport without damaging the mandrel itself.