As I mentioned the SG10 pedestal guard is 58" tall & 1" OD. 58" is pretty tall on most boats. The nice thing is that this extra height allows you to decide just how tall you want to make it. I general find cutting 3-4" off is the perfect height for most owners. This still allows for a good hand hold and room for the plotter to clear even a fully enclosed compass.
For cutting 1" SS tubing I use a Ridgid pipe cutter with stainless cutting wheel. A standard cutting wheel will work to cut two SS legs but will pretty much be toast afterwards. I find the pipe cutter to make the cleanest cuts. I generally recommend buying Ridgid pipe/tube cutters as parts and cut-off wheels are always available. I can still get parts for some of my 40+ year old Ridgid cutters!
Before the Ridgid name was in Home Depot they were the plumbers tool line of choice. Home Depot simply bought licensing rights to use the Ridgid name. Buy one at a plumbing supply house and you'll save some money...
Once the legs are cut to length be sure to de-burr the inside of the legs. I use a Dremel and grinding wheel to do this. You don't want the guard legs to mar or slice the wires jacket or the wires themselves..