Marine grade alloy.Designed for welding.Pilot hole dimples underneath.Other Details: Part No. Description Shaft Ø(mm) Width(mm) Height(mm) Base(mm) 29104 Alloy Weld On Bollard 19 80 85 60 x 62 29105 Alloy Weld On Bollard 21 100 100 75 x 75 29116 Alloy Weld On Bollard 27 150 142 187 x 187