Expands your existing pm-3500 Mobile base from 32" To 45" In one inch increments to accommodate 30"-52" Fence systems. Its an industrial strength, fully-adjustable rolling T extension platform, when coupled with a pm-3500 has a weight capacity that exceeds the competition by hundreds of pounds. The all steel construction, solid corner brackets and "smooth As silk" Casters with foot control locking lever ensures the strength and stability you are looking for. Has one movable lockable foot levers. Ideal for virtually all larger machines (like table saws and lathes) and anything else you need to make "mobile". Everything you need is included and we back it with a full one year.