18-gauge. Ideal for fastening case corners, drawers, cabinets, picture frames, molding, and decorative trim. For use in Porter Cable model No. BN200V12, BN125A, BN200A, BN125 and BN200, Bostitch model No. BT-35, Senco model No. SLP20, Paslode model No. 2138-F18, Makita model no. AF501, DuoFast model No. BB444, Hitachi model No. NT45A, Airy model No. ATK0241, and ATK0250. 5000 per box.