This is a putter adapter that converts a regular putter head that has a 90 degree (straight up and down, not angled) .370 socket hole into a Plumbers-Neck style putter. Pretty neat, eh? When epoxied in the socket, it converts the lie of the putter from 90 degrees to the standard 72 degrees. The plumbers neck provides offset, putting the shaft in front of the putter head as many golfers prefer. This is only for a right-handed putter head.