16GA 1/2" Medium Crown Bostitch 16S4 Type Staples - Galvanized Finish - For Use In - Spotnails: M1S76-8650, X1S76-8650, X1S76-8650LM, MS76-8650i, XS76-8650; Bostitch: 750S4, 850S4, T55S4-1, T40S4-CT, T25-1, T36-50, 650S4-1, T50S4-1, 438S4, T38