Attwood Marine Battery StrapStraps are woven polypropylene with "firm-grip" buckles and are completely resistant to battery acid.Installation Instructions: Lay template on boat floor. Center clamps lengthwise on box so they fit up into bottom groove.; Locate and mount clamps on flat surface of boat floor, using template and screws provided.; Route strap under clamp opening, making sure buckle is positioned properly on top.; Place box over clamps so that lip on box bottom sits outside clamps.; After battery installation, buckle strap over cover.; Information sourced from Attwood Battery Box Clamp Installation Instructions