7 in pads are manufactured both with a 5/8 in x 11 in threaded design and a non-threaded 5/8 in hole design
The 6 in pad offers a unique diameter option the 5 in pad, complete with an attached arbor, will quickly mount to a power drill the 4-1/2 in pad can be attached on either a 5/8 in spindle or 10 mm spindle