Well made item
Although badged for an ISO, I purchased it for use on an old Holt fibreglass Solo that had gudgeons on both the rudder stock and the transom that the pin passes through to hold the rudder in place.
It was cheaper to purchase this pin than fitting new hardware to the transom and rudder stock.
I expected there to be a hole drilled in the end for a retaining spring ring but there wasn't. However, it wasn't too big a job to drill one for the purpose.