They were on the boat when I bought it. We believe the boat was a K boat or a PS boat before but nobody remembers the fisherman from the Texas coast that used to race it. The 1" transom rod and the cav setup seemed to be done right back for back in the day. To be honest, I just assumed they were 6061 5 gauge but have since been told they were probably 3/16th. The screws were 3/16 stainless fine thread bevel head with lock nuts.

The crack started at the water pickup and than ran pretty straght along the screws for the turnbuckle pads toward the middle. Towards the outside the crack was jagged and moved in closer to the transom. Over all the crack probably measures 7".

Any quick way to determine what type it is?