This Merit® super finish AO coarse grit threaded shank mini flap wheel is designed to remain supremely flexible and conform to your workpiece, providing a uniform finish as a result. It works well for coarse grit cleaning and low pressure applications, providing chatter free finishes thanks to its 1/4-20 threaded steel shank's excellent balance. Change this wheel quickly with no need for special tools and enjoy an excellent cut rate and long life from its quality aluminum oxide abrasive.