Extends your existing pm-3500 mobile underlay at 32" 45" in 1" increments to 30" 52" fence systems. It is an industrial strength, multiple rolling T-platform, when combined with a pm-3500 has a weight, outperforms the competition by the hundreds of pounds. The all-steel construction, solid angle "and" smooth like silk wheels with foot control locking lever ensures the strength and stability you are looking for. Features a variable lockable foot lever. Ideal for almost all larger machines (e.g. table saws and lathes) and everything else you need to "mobile". Everything you need is included and we provide it with a full 1 year warranty.