Harlingen 15 Piece High Speed Steel M3-M12 Tap & Drill Set The Harlingen 15 piece HSS Metric Tap & Drill Set provides a complete threading solution. Featuring plug-style spiral point taps for efficient chip removal in through holes, this set includes matching drills and taps, a tap wrench, and a fitted case to keep you organized. Made from durable HSS steel for long tool life, it's ideal for metalworking, automotive repair, machinery maintenance, and threading certain rigid plastics. Note that when threading plastics, lower speeds and lubrication are recommended. The spiral point plug taps drive chips forward, ideal for through holes. This set is ideal for mild steel, aluminum, copper, and certain rigid plastics. Included in this set are drills 2.5-10.2mm, spiral point plug taps 3-12mm, a tap wrench & fitted case.