The Extreme Max Heavy-Duty 90° Corner Dock Kit is designed to help the do-it-yourselfer build the dock of their dreams! One box contains half the hardware components necessary to complete a standard dock section assembly, lumber not included. For the full hardware set, purchase two boxes of the Extreme Max 3005.5522 Heavy-Duty 90° Corner Dock Hardware Kit. Each box includes (2) large heavy-duty 90° inside corner dock plates, (2) large heavy-duty 90° outside corner dock plates, (6) small backer plates, (3) small 90° corner brackets, (28) M12 carriage bolts, (28) M12 flat washers, and (28) hex nuts.