The sb hc50fn concrete block nailer is a 15 gauge finish nailer which is capable of driving high carbon zinc dichromate hardened nails into concrete blocks to 7 newtons designed to drive tungsten hardened nails into almost all forms of concrete block the sb hc50fn can fix door liners into block and gripper rods into floor screeds it is not recommended that this tool is used to drive nails into any form of strengthened concrete or engineered and glazed bricks specification magazine capacity 100 n