Duo-Fast DF175-CN 7/8 inch - 1 3/4 inch Roofing Coil Cap Nailer Designed for the installation of synthetic roofing underlayment and roofing felt In-line design, provides balanced tool and consistent drive of fasteners Swithable button for easy transition to nail only fastening, bump fire operation Adjustable depth of drive, easy fast loading, exhaust cap Consistent drive performance, High load capacity 240 caps