... inchIn metric unit(mm)1/4" x 1/4"6.4mm x 6.4mm22,23,243/8" x 3/8"10.6mm x 10 ... ,19,20,21,22,235/8" x 5/8"16mm x 16mm18,19,20,21,3/4" x 3/4"19.1mm x 19 ... .11mm,1.83mm,1.65mm2" x 4"50mm x 100mm2.11mm,2.5mm4" x 4"100mm x 100mm2.0mm,2.5mmTechnical Note ... .7mm x 12.7mm16,17,18,19,20,213/4" x 3/4"19mm x 19mm16,17,18,19,20,211" x ...