Weiler 58090 4-1/2" x 1/8" Tiger Pipeline, Z30T, Type 27, 5/8"-11 Nut (Pack of 10)Weilers Tiger Pipeliner Grinding Wheels are designed specifically for pipeline applications. Whether grinding a bead, facing the land, prepping transitions, or fabricating in the yard, this 1 8 inch thick wheel (aka bead grinder, grinder disc) delivers aggressive grinding and reduced chatter throughout the life of the wheel. Hitting a grinding wheel with a file to make it work is a waste of time, shortens wheel life, but most importantly its unsafe.