The perfect set of pliers to steady your tube or heavy gauge wire for cutting. There is a groove cut through the head of the tool. These pliers are best used with a jeweler's saw. Grip the tube between the jaws of the pliers, insert the blade in the groove and use the saw to cut.
Kate Richbourg uses these pliers in our Introduction to Riveting
The jaw has three chambers to fit three sizes of tubing or wire. The inside diameter of each hole is as follows: Small hole-3mm, Med hole-5mm, Large hole-6.5mm.