Suitable for closing metal cabinet doors, securing access panels/doors, and sheet metal protective shrouds. They enable quick and easy opening, access, inspection, internvenire and reclosing. The type 1 M male and type 1F female are manufactured from PA66, the female contains is enclosed by a hardened steel spring and snaps on securely. Insertion of the male is by pressure and requires the use of a tool. Retaining devices prevent the fasteners from falling out and being lost.