Sorry... that was 80/20 1515 not 1516 (typo). The corner brackets and hardware are all 80/20 also. I used mainly triple plates but had to get the knobs from a hardware store. All the hardware is 5/16-18...again from 80/20. Size to fit your lathe. I used 3 two ft. 1530 for the frame and two 2 ft 1515 for the cross members. I extended the base with some short pieces of 1515 to make it more stable and adapt to my Robust lathe. Oh.....to keep the brackets holding the wheels from turning I welded an allen into the double nut bracket (you can use epoxy if you want or just use another knob).