The internal thread of this flapper adapter is 5/8"-11, which is suitable for various 5/8" angle grinders. It can convert the angle grinder into a power tool with rotation function. The matching 1/8" and 1/4" collets with 4 jaws can provide better contact and stronger grip. It is easily compatible with various accessories, widely suitable for flapper wheels, carbide burrs, cutoff wheels, and polishing wheels. The adapter body and chuck nut are made of high-quality 303 stainless steel, which has good heat resistance and can maintain good performance even in high temperature environments.