Made to work with .95 in. diameter torch heads, the JEGS 81599 plasma circle cutting guide allows for quick and easy setup for accurate circles from 3 3/4 in. (9.525 cm) to 17 in. (43.18 cm) in diameter. The unit comes with a rotating torch cap holder, two adjustable tension rollers, 20 in. (50.8 cm) arm, and a center pin with an adjustable knob. This circle cutter will work with Jegs Plasma Cutters 555-81545 & 555-80601