Nr. 90 pcs. Annular Ring Stud, Carbon Steel, 3/16"Diam 3/4" Long, Arc Weld Stud. Nr. 90 pcs. Annular Ring Mushroom Cap, Aluminum, 3/16" Diam. Stud Nr.23 Annular Ring Anchor Bolt, Carbon Steel, 3/16"Diam. 7/8" Long, with perforated 2" x 2" back plate