Reinforced Internal, Full-Length Pounding Members (Absorbs Excavator Blows During Box Driving For Longer Box Life), Solid-Forged Steel Spreader Sockets (No Pinhole Egging/Less Repair), Internal Shelving, High-Tapered Knife Edge For Narrow Ditch, But Wider Pipe Zone (Save Costly Fill/Bedding), Solid Full-Weld Throughout The Box., Hours: 0