Tiger Aluminum Back 4.5 inch 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∞ ñ 35∞ for aggressive stock removal on flat surfaces while the 36 grit abrasive grain is best for heavy stock removal, edge beveling, and chamfering with a right angle grinder.