Industrial grade flap discs for a variety of applicationsALLSTEEL features a unique zirconia alumina abrasive grain blend that self-sharpens with less pressure, providing a high removal rate with angle grinders. ALLSTEEL is an economical solution for operators who need a quality, industrial grade flap disc for a variety of applications.Features: Special zirconia alumina grain blend self-sharpens with less pressure Provides a high removal rate on steel Trimmable backing extends disc life The economical choice when blending sharp corners, heavy deburring or blending in fillet welds Materials:Steel Number Diameter Grit Max RPM 15-W 454 4-1/2" 40 13,300 15-W 456 4-1/2" 60 13,300 15-W 458 4-1/2" 80 13,300 15-W 462 4-1/2" 120 13,300 15-W 504 5" 40 12,200 15-W 506 5" 60 12,200 15-W 508 5" 80 12,200 15-W 512 5" 120 12,200 15-W 604 6" 40 10,200 15-W 606 6" 60 10,200 15-W 608 6" 80 10,200 15-W 612 6" 120 10,200 * All Pictures Shown Are For Illustration Purpose Only. Actual Product May Vary Due To Product Enhancement.