Sk Professional Tools Socket Set: 3/8 in Drive Size, 11 Pieces, 1/4 in to 3/8 in Socket Size Range

These SAE pipe plug socket sets, also known as male pipe plug sockets, have a nub that sticks out from the end of the male socket that fits into the square indentation on the head of the fastener. Some sets include female pipe plug sockets that have an indentation to fit the square nub on the head of the fastener. Sets come with an assortment of sockets for a range of fastener sizes and are measured in inches and fractions of an inch to fit fasteners with an SAE (inch) size head. Sockets are used to tighten and loosen pipe plugs found in plumbing applications.