Syntec Flat Top Half Round PCD Cup Wheels are manufactured with premium grade polycrystalline diamonds. PCD's may be very wear-resistant but they are not impact resistant. It's important you watch out for joints, bolts, and anything else made from steel. Great for removing thick coatings, epoxy, and other membranes. Syntec has served the diamond tool industry for decades, leading to the highest quality diamond tools available. Try the Syntec difference today!