Attwood Marine Battery Strap Straps 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 b