Acrylic Gridwall Display Case Tower. The Rectangular Gridwall Display Case has 2 stationary shelves that are removable. The 2 shelf gridwall display case tower is locking and has a single door. Keep your merchandise safe behind lock and key with this acrylic display case tower, while featuring it on your gridwall. This acrylic gridwall display case is also called a grid wall showcase tower with 2 shelves.