... ,21,22 1/2" x 1/2" 12.7 x 12.7 16,17,18,19,20,21,22,23 5/8" x ... 5/8" 16 x 16 18,19,20,21, 3 ... " x 3/4" 19.1 x 19.1 16,17,18,19,20,21 1" x 1/2" 25.4 x ... 12.7 16,17,18,19,20,21 1-1/2" x 1-1 ... /2" 38 x 38 14,15,16,17,18,19 1" x 2" 25.4 x 50.8 14 ...