Comparison : Item # 421-49514, 4" x 5/8-11" Standard Spiral Pattern Medium Back-Up Pad without Nut
Item # 421-48220, 4-1/2" x 5/8-11" Standard Spiral Pattern Medium Back-Up Pad without Nut
Item # 421-48221, 5" x 5/8-11" Standard Spiral Pattern Medium Back-Up Pad without Nut
Item # 421-48222, 7" x 5/8-11" Standard Spiral Pattern Medium Back-Up Pad without Nut
Item # 421-48239, 9" x 5/8-11" Standard Spiral Pattern Medium Back-Up Pad without Nut