"This heavy-duty steel dock board is held in position using two 1"" stress-proof steel pins. When properly positioned in the side pocket location holes, these pins hold the dock board firmly in place guarding against slippage. Raise sides help the user to prevent run-off. Two four-hole pin pockets placed on each edge allow for flexible positioning. This dock board features a double-bend design and fold-down lifting loops for added versatility. Increase safety, product life, and work efficiency with these solid steel dock plates. Determine the Height Up in your application by viewing the diagram below. TFL & TNB models are not recommended for below dock loading. All portable dock boards and plates are not created equal. Bluff manufacturing is the only manufacturer that has tested their boards and plates and has met the ANSI standard. This means they are in compliance with ANSI standard MH30.2."