X 3 8 21 July 8, 2019 16 32 64 128 2 3 x 8 21 3 8 x 21 sanding belt 4 3 x 21 8 16 3 8 x 21 1 2 16 3 8 x 21 1 2 air filter 16 3 8 x 21 1 2 filter 3 8 x 16 21 3 x 8 )= 21x 3 x 8 )/ 5 21 2x 3 x 8 )=- 21 3 8 x 21 belt sander 3 8 x 21 v belt 3 8 x 216 3 8 x 21 belt 3 8 x 210