4 Pack of 1/2 Dia x 2-1/8 W x 7-3/8 L Boat Trailer Square Galvanized U-Bolts Heavy Duty 1/2 inch diameter U-Bolt Specifications: heavy duty 1/2 inch diameter 2 1/8 inch wide between the legs 7 3/8 inch Long from the inside down Hot Dipped-Galvanized to prevent corrosion Great for any trailers, boat , jet ski, landscape, etc exposed to wet or humid conditions. Package includes: 4 x 1/2"x 2 1/8"x 7 3/8" Squared U-Bolt 8 x Galvanized Nuts 8 x Galvanized lock washers 8 x Galvanized flat washers P Professional Installation is Highly Recommended (No Instruction and Wiring Diagram Included)