Merit Abrasives - 4" Disc Diam, 150 Grit, Aluminum Oxide Quick Change Disc - Type S Attaching System, Nonwoven, Blue, Very Fine Grade, 15,000 RPM

Type S attachment systems feature a turn-on/turn-off style fastener (1/4-1/2 turn to lock in place). They are interchangeable with TS and Type II Styles.

Aluminum oxide is the most commonly used abrasive. Best-suited for general purpose deburring and blending, it is tough, economical and fracture resistant. Commonly used on ferrous alloys, high-tensile materials and wood.