Features： 1、Application: The galvanized swivel bunk bracket kit with the flat surface is suitable for your boat's and trailer's 3in x3in cross members. 2、Complete Kit: This kit contains everything you need to mount bunk boards (not included) to your trailer. Perfect for saltwater or freshwater use. 3、Adjustable Height: Swivel bunk bracket is 8in height, with multiple slotted holes in the bunk support allow for height adjustment. 4、Including Mounting U Bolts: The included hot dipped galvanized u bolts secure the bunk brackets to the crossmember for a tight fit, safe to use. 5、High Strength Construction: Constructed of high hardness metal material, wear resistant, sturdy and durable, not easy to crack or break. Specification： Item Type: Swivel Bunk Bracket Kit Material: Metal Fitment: Fits 3in x 3in boat trailer crossmembers. Brackets measure 8in tall. Comes with 1/2in x 3in x 4 5/16in u bolts. Bracket, top angle and u   bolts are hot dipped galvanized. Application: For trailer cross member fixing, etc. Package List： 8 x Bracket 4 x U Bolt 4 x Screw 8 x Screw 32 x Spacer 12 x Nut