Description Fast disconnect fastener with self locking ring that snaps into position. Carbon metal building, zinc plated to withstand rust and corrosion. Comprises: 16 computer 3/sixteenâ x 1 7/sixteenâ, 18 computer 1/fourâ x 1 3/fourâ, 6 computer five/sixteenâ x 1 3/fourâ, 10 computer 7/sixteenâ x 1 3/fourâ.