Stainless steel set includes 2 gudgeons, 1 long pintle, 1 short pintle, and stop tang. Pintle tangs will accept a rudder up to 1-1/2" thickness.  Pintle diameter is 5/16" (7.9mm).

The gudgeons can be shaped to fit the skeg of a Skerry or the flat transom of a Passagemaker (for example). It is recommended, if you have a flat transom, that you use a bolt and nut to secure the gudgeon whereas a Skerry simply needs four wood screws.

The following fastener recommendations are for boats with a flat transom (see the top row of "We Also Recommend" items):