HSM-10 1/2-13 x 2" Button Head Socket Cap-Screw 18-8 SS with 5/16-18 hole drilled and tapped the length of the inside of the bolt.
WAG Boarding Steps™ Model HSM-10 uses two (or three) hex drive threaded inserts. These standard inserts work well with plywood and composite decks no more than 5/8” thick.
Customers using the ladder for a saltwater application may experience corrosion of the standard inserts and these inserts are known not to work on pontoon boats with aluminum decks (e.g., Veranda) and pontoon boats with composite decks more than 5/8” thick (e.g., South Bay).
Therefore these custom Stainless Steel fasteners were designed to mitigate this.