Heavy-duty aluminum ladders for permanent mounting on dock or seawall.Crafted from heavy-duty, marine-grade, 1 1/4"ID 6063 T-5 aluminum pipe, these Straight Dock Ladders feature a super-strong 665lb. per rung maximum boarding weight capacity. Welded for strength, the extruded aluminum channels are serrated to produce a nonskid surface with no sharp edges. Available in both standard 2" depth and foot-comforting 4" depth wide rung models. Require four 4 1/2" lag bolts for installation (sold separately).Wide RungThe wide-style rungs measure a full 4" in depth, with slightly rounded edges and a deeply-grooved, extruded surface that ensures greater comfort and traction that provides increased stability when climbing in or out of the water.Standard RungThe standard 2" deep flat ladder rungs are designed with no sharp edges and feature a long-wearing, applied nonskid surface material.