Innovative beam, on INTERLAKE InterRack-30 Pallet Rack, features a patented stud and keyhole that increase rigidity and reduces stress at the connection. Choose either U-punch or teardrop keyhole beam connection. Upright frames feature a combination of narrow keyholes (punched every 2") and offset rectangular holes allowing beam to seat automatically into column, locking securely in place via a piston (pull-pin) lock. High-strength steel columns have 55,000 psi min. yield strength. All-welded constuction. Welds are made to AWS standards to ensure strength and long product life. Hardbaked enamel finish is corrosion and scratch resistant and meets or exceeds all environmental regulations.NOTE: to build pallet rack you must order both upright frames and solid beams. Add skid supports, spacers, and beam ties as needed. Call a Certified Product Specialist for assistance.