... 20,21,221/2" x 1/2"12.7mm x 12.7mm16,17,18,19,20,21,22,235/8" x ... 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 ... unit(mm)1/2" x 1/2"12.7mm x 12.7mm16,17,18,19,20,213/4" x 3/4 ... "19mm x 19mm16,17,18,19,20,211" ... x 1"25.4mm x 25.4mm15,16,17,18,19,20Technical Note: 1.Standard roll length: 30m;width ...