For heavy-duty stapling jobs such as insulation, carpet underlayment and roofing felt. Fits wide crown tools. For use in Stanley model No. TR70, TR80, TRE50, TRE100, and TRE300; Swingline model No. 800, 800X, 900, 1000, 10060, 31600, 31800, 34201, 34301, 34302, 8000, and 80020.