11371 #130 Inflatable Drum

The sander actually becomes flat when pressed against a flat surface and round when pressed against a round surface i.e. the sanders conform to the underlying surface. Consequently the sanders should be filled with very little air. The #130 Drum has a 1 1/8" Diameter and is 3 1/8" long with a 5/16" Dia. Shaft.

The sander actually becomes flat when pressed against a flat surface and round when pressed against a round surface i.e. the sanders conform to the underlying surface. Consequently the sanders should be filled with very little air.  The #120 Drum has a 3/4" Diameter and is 1" long with a 1/4" Diameter Shaft.