The Forney 60052 Mounted Grinding Wheel is designed for use with 1/4" (6.35 millimeters) chuck power drills, featuring high-grade 60 grit aluminum oxide for durable and effective grinding, polishing, or deburring of ferrous metals and hard surfaces. This compact wheel is the perfect size for tight spaces and won't wear out quickly. Specifications: 2" x 1/4" & maximum RPM of 3,450. Comes carded.