1/8\" hot-dip galvanized steel. 7/16\" holes for 3/8\" carriage bolts. Bolts included are stainless steel. Large surface area is used in soft bottom areas. Leg pipe can extend through the pad into lake bottom for extra lateral support. Pointed corners grab when the bottom is rocky. Pipe above pad: 2-3/8\" H and pipe below pad: 1-1/2\"H