Title is pretty self explanitory. This is the PT-1 model designed to be used for 3/32”, 1/8” or 5/32” wire. I just bought it (used) before checking the diameter of my rigging which is 1/4”. The 1/4” wire will fit and the tables are the same for the PT-1 and PT-2 gauges but I’d prefer to have the correct model. So it’s up for sale again. Contact Don