Blendex U™ Finishing Cup Disc, 4-1/2" Dia., Fine Grit, Silicon CarbideTo be used for deburring, blending and finishing any kind of metal, including stainless steel, titanium, aluminum, alloys and or plastic and fiberglass For use on angle grinders with suitable speed range Eco Trim trimmable backing extends disc life by up to 3 times Spin On system for fast and easy changeover Reduced waste; Eco Trim allows trimming the backing pad up to 3 times to expose unused material and extend the life of the product Less plastic;