... solidity.A,Polyhedron with thirteen faces.B,Pitch is 50 mm, beam is adjustable.C,Triangle hole easily tightens ... square tube,no C-shaped ,square tube is 30*50 ,30*30, and so on. Support for metal ... . Pallet stopperFor pallet stop, speciully for fork lift in top oppration.Row-spacerRow-spcaer,to be two lines ... capacity of each layer6. LAR Color you want ( beam /drive in rack)heavy duty warehouse racking