18-gauge. 1/4" crown. Galvanized staples. For use in: Craft assembly, picture frames, toy building, casebacks, shelving, soffits, fascia, cabinets, drawer building, and light aluminum to wood. For use in AccuSet model No. A100LS and A150L; Senco model No. SMS-L, SLS18, SIS-20, SKS-L, and SLS-20; Porter Cable model No. NS150; DuoFast model No. KN-1848 and BN1832S; Campbell Hausfield model No. SN258K; Hitachi model No. N3804A.