Product Info Catalog Automotive Trailer & Towing Trailer Products 3-1/8 In. Shackle Strap, 1.25-In. x 9/16-In. 3-1/8 In. Shackle Strap, 1.25-In. x 9/16-In. Request a Quote UPC: 805089562056 SKU: 180951 Model Number: UW562050 1.25"W x 9/16"D, Shackle Strap, 3-1/8" Hole Center, For Mounting Trailer Suspension Springs To Trailer Under Carriage.