Trimax SXTC123 Stainless Steel Universal Coupler Lock for 7/8" - 3-1/2" Span Slides to fit 7/8 inches, 2-1/2 inches, 3-1/2 inches spans Full length pin made of solid forged machined steel Patented design, incorporates O-ring and water tight cap to help seal out dirt and corrosion Large dual lock lugs Easy 1/4 turn operation