Loading... Please wait...These clips can be used where a staple gun simply cannot penetrate to get a good grip. Hard woods, some vinyl surfaces and mortar can cause staples to fold up or simply not penetrate. The hardened nail, preinserted in each part, can be driven into these morechallenging surfaces with a hammer. Can be used inside or out. Double sized for running and fastening 2 coaxial cables with one clip.