This premium-quality 40 grit ceramic alumina provides the ultimate performance with the longest life and fastest cutting rate across all abrasives. It has a self-sharpening feature which increases high stock removal and durability. The strong plastic backing allows increased flexibility and fast cutting action on medium to high pressure applications. The M14 connection allows for the quick changing of discs. The plastic backing can be trimmed to extend service life. Designed for contoured and flat-edged surfaces. Ideal for sanding, grinding, removing rust and weld preparation of metal, carbon steel, stainless steel, sheet metal, wood and plastic. Compatible with 115mm angle grinders including Stock No. 56488. Features and Benefits • Enhanced cutting rate and durability • Self-sharpening feature which increases high stock removal and durability • Strong and trimmable plastic backing • Ideal for contoured and flat-edged surfaces when sanding, grinding, removing rust and weld preparat