Diamond Plated System Always use wet with Crystalcut - a water additive and rust inhibitor. Featuring a semi-flexible fiberglass backing. The diamond plated system is for grinding; the diamond resin system is for polishing. Available with 1/2in. center hole or with PSA (Pressure Sensitive Adhesive). If this item is not in stock it will be special ordered. Lead time is usually 3-4 weeks, from the time of order. Call or email with questions.