A clasp device with a female member defined by an annular body and a male member adapted to be received into said female member. The female member is of unitary construction with a first opening and a second opening. These openings are spaced apart from one another with a passageway formed therebetween. The male member has a base member and a projecting member; the projecting member being affixed to and spaced apart from the base member through a positioning pin disposed in a space between the base member and the projecting member. This positioning pin is slidable through the passageway after the male member is inserted into said first opening of the female member and the female member is between the base member and said projecting member.The male member is slidable into locking engagement with the female member by urging the positioning pin through the passageway into the second female opening, and locking the male and female members takes place by rotational movement of the male member. This urges the positioning pin to assume an orientation with respect to the second female opening sufficient to inhibit slidable movement of the male member with respect to said female member, through said passageway. Movement through the passageway takes place when the central axis of the male member is at 90.degree. with respect to a central axis of said female member and by rotating the male member 90.degree., relative to said female member the positioning pin causes locking to take place.