This 8 way hand operated turntable changes your trains direction by turning the crank. The inside rotating dimensions of this turntable is approximately 3 1/4 inches long. This track piece is manufactured from 100% hardwoods. It is Compatible with Thomas the Train, Brio and other fine wooden train sets and accessories. Length and height dimensions sometimes vary between the different brands but that doesn't diminish their ability to interconnect and make amazing layouts! For ages three and up.