Nonslip lids have a knob for easy lifting and PTFE retainers inside to prevent the lid from accidentally sliding off the tank. Manufactured from sturdy molded glass bricks that will withstand regular use for many years. The clear sides allow unobstructed visual inspection of TLC plates up to 20 x 20cm in size. Top of tank is ground flat to match the lid, and the edges are beveled to remove any sharp edges. Bottom is ground to provide a flat, level surface. A raised ridge along inside bottom allows simultaneous development of two 20 x 20cm or four 5 x 20cm plates. Inside dimensions of the tank are approximately 27cm W x 7cm D x 25cm H (10 5/8 x 2 7/8 x 9 3/4"). Weight is approximately 5.4kg (12 pounds).