4” Cylinder Transport Rack will hold eight 4in (102mm) diameter concrete cylinders for curing and transport. Plastic rack also allows easier handling of multiple cylinder specimens. Dimensions: 19x9.5x5.4in (483x241x138mm). 6” Cylinder Transport rack will hold nine 6in (152mm) diameter cylinders for initial curing and transport. This sturdy molded plastic rack is lightweight and waterproof. Dimensions: 24x24x8in (610x610x203mm)