100 pack, 1/4" x 4.5", galvanized hex lag screw, extremely sturdy, ideal for outdoor projects, attach objects to wood, common applications include retaining walls, deck frames & outdoor play equipment, when used with a lag shield can also be used for masonry application, coarse threads with a hexagonal drive & requires clearance above the fastener, galvanized finish which contains more corrosion resistant properties, allowing it to last longer than those made with traditional steel, use in a pre-drilled hole.