Teks #14 x 2-1/2 in. Zinc-Plated Steel Hex-Head Phillips Self-Drilling Lath Screws (30 per Pack) are great for use in HVAC and electrical applications. These screws tap their own threads and do not require predrilling. Engineered drill point and flute (pilot section). Install with a standard screw gun and a 3/8 in. hex drive bit (installation materials are not included).