Wall Standard Systems Wall Standards (1/2" slot) (4) Wall Standard (1/2" slot) Shelf & Hangrail Brackets (12) Wall Standard (1/2" Slot) Faceouts & Waterfalls (2) Wall Standard (1/2" Slot) Hangrails (3) Rectangular Tubing Accessories (15) Rectangular Tubing Hangrails & End Caps (4)