Brent SRC Slab RollerThe SRC is a portable slab roller designed for small projects (not for production or schools). It can be used on a table or as a floor model with the optional leg set and has a patented cable drive system with opposing rollers that produces even pressure along the bed. The SRC comes with one 1 4" shim with canvas, four 1 4" plain shims and one 1 8" plain shim. Maximum slab dimensions: 21"W x 40"L. Maximum slab thickness is 1 1 4". Assembled