Hi Bob,
My beaching legs are made from 10cm diameter aluminium extrusion with cast aluminium foot and head.
The foot is 22cm square with 4 triangular flanges on each corner to support the 10cm deep socket for the tube. The head
as you can tell from the photo has a flat face which fits flush
to the hull side (a rubber mat/washer seperates the head from the hull)
The bolt hole is centraly positioned 5cm from the top.
The overall length of the feet is 230cm.
Hope that helps if you require any further info please
let me know.
Kind Regards
Alan