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The Ultra-fine grey 2” x 1” x 1/4” Mounted Interleaf Flap Wheel by Black Hawk Abrasives are the perfect abrasive for polishing pipes, tubing, or in other compact areas and irregular surfaces. These 2 inch flapper wheels are designed with alternating gray, super fine, non-woven abrasive pads and high grit aluminum oxide sanding sheets in a fan-like pattern around a center shank. This allows for some light sanding while still polishing and provides flexibility in tight corners and crevices. Use the 2" gray interleaf flap wheels on a drill or die grinder.