Overlap slotted discs are used for deburring and polishing radii, holes and cylinder walls. The 2/set configuration cuts on the inward motion only, while the 4/set configuration cut on both the inward and outward motion. All are furnished with a standard quick-change eyelet. Merit® Coated Abrasive Disc, Overlap Quick-Change Slotted, 4-1/2 in Diameter Disc, 120 Grit, Medium Grade, Aluminum Oxide Abrasive, Cotton Backing, X-Weight Backing Weight, 1/4-20W Eyelet, 2 Layers