(WH-SM) The Single "T" Male has one 5/8" tab with a hole for a 3/4" Connector Pin (B-PIN) and is used with a Single "T" Female (WH-SF) or Outside Corner Female (WH-OCF). The male and female singles can both be used to make finger attachments by bolting them to the side of a dock. They can also be used to make ramps by bolting them to seawalls.