... 21,3/4" x 3/4"19.1mm x 19.1mm16,17,18,19,20,211" x 1/2"25.4mm x 12.7mm16,17 ... ,18,19,20,211-1/2" x 1-1/2"38mm ... x 38mm14,15,16,17,18,191" x 2"25.4mm x 50.8mm14,15,162 ... " x 2"50.8mm x 50.8mm12,13,14,15,16Technical ... ,19,20,213/4" x 3/4"19mm x 19mm16,17,18,19,20,211" x 1"25.4mm x 25.4mm15,16,17,18,19 ...