Comparison : Item # 421-70211, 5/8" x 5/8" x 1/4" Aluminum Oxide 60 Grit Aluminum Oxide Flap Wheel Flex Backing
Item # 421-70212, 5/8" x 5/8" x 1/4" Aluminum Oxide 80 Grit Aluminum Oxide Flap Wheel Flex Backing
Item # 421-71000, 3/4" x 3/4" x 1/4" Aluminum Oxide 60 Grit Aluminum Oxide Flap Wheel Flex Backing
Item # 421-71001, 3/4" x 3/4" x 1/4" Aluminum Oxide 80 Grit Aluminum Oxide Flap Wheel Flex Backing
Item # 421-71002, 3/4" x 3/4" x 1/4" Aluminum Oxide 120 Grit Aluminum Oxide Flap Wheel Flex Backing