Minimize downtime and maximize abrasive life with RADNOR Trimmable Zirconia Type 27 Flap Discs. Featuring an easily adjustable trimmable plastic backing, these discs let you use more of each flap to dramatically extend product life during edge chamfering and weld blending. They are available in a 4 1/2" size, mount seamlessly to 7/8" and 5/8" - 11" arbors, and are offered in a robust 40, 60, and 80 grit range.