The United Abrasives/SAIT Type 1/Type 41 Saitech Ultimate Performance™ Thin High Speed Cut-Off Wheels are a high performance wheel that allows for fast cutting with an extremly hard life. This wheel is extremly durable and self sharpening for long life and a cooler cut. The Saitech Ultimate Performance™ is composed of a high performance, ceramic aluminum oxide grain formula. United Abrasives/SAIT wheels are externally reinforced with fiberglass layers to provide ultimate safety in a thin wheel. Proudly manufactured in the USA.