... /2" 12.7mm x 12.7mm 16,17,18,19,20,21,22,23 5/8" x 5/8" 16mm x 16mm 18,19,20 ... ,21, 3/4" x 3/4" 19.1mm x 19.1mm 16 ... ,13,14,15,16 2" x 3" 50mm x 75mm 14,13,16 3" x 3" 75mm x 756mm 12,13,14,15,16 ... 2" x 4" 50mm x 100mm 13,14 4" x 4" 100mm x 100mm 13 ...