Tiger Aluminum back 4-1/2 in conical flap discs are the benchmark for the pipeline industry, providing rigid support for maximum aggression when grinding steel and stainless steel. These wheels are ideal for removing heavy pitting and resists rolling the pipe bevel ends prior to welding. The aluminum backing also prevents the disc from catching on the bevel when grinding. The type 29 conical disc shape maximizes surface contact when grinding between 15 to 35 deg for aggressive stock removal on flat surfaces while the 40 grit abrasive grain is best for edge beveling, chamfering, weld grinding and blending with a right angle grinder. This disc offers a metal 5/8-11 nut that allows for quick changeovers and prevents the disc from sticking to the spindle.