A drill with a central pin or projection to enter a hole, for enlarging the hole, or for sinking a recess for the head of a bolt, etc.; a counterbore.

(historical) An instrument for crimping or puckering the border of a lady's cap.

(horology) A pin against which a lever strikes, to limit its motion.

In locomotives, an iron rod fitted between the springs and the axle boxes, to sustain and regulate the pressure on the axles.

plural of split pin

A metal fastener with two tines, the ends of which project through an object being fastened and are bent back to hold it in place.

plural of kirby pin

Alternative form of kirby grip

Alternative form of tiepin

plural of hair pin