Plastic insulated staples are used to attach Romex , UF, and other type NM cable up to 3-conductor (No. 10). Fast and easy-to-install, both of the zinc-plated nails can be driven together without splitting wood. Nail heads recess into the staple for minimum exposure. Made of high-grade UV-resistant polyethylene, they will resist rot, rust, and resist the effects of temperature extremes and the degradation of the ultraviolet rays of sunlight. 15/clamp.