All of our borosilicate tubing and rod is measured in millimeters.
Most of the sizes are presented in this format:
a x b x c for tubing or a x c for rod, like 25.4mm x 4mm x 1500mm ( 1" Extra-Heavy Tubing) or 3mm x 1500mm (3mm rod)
a = Outer diameter
b = wall thickness
c = length of the tube or rod, usually 4 or 5 feet long
1 inch = 25.4 millimeters
If you have any questions, please don't hesitate to contact us by phone or email before placing your order!