Our Hole Hogs, or core drills, are made exclusively for enlargening existing holes. Made from high-molybdenum tool steel for high strength and resistance to wear and coated with a black & gold coating for maximum lubricity, these drills have a 4-flut cutting surface which eliminates the catching and hogging-in which happens when standard drill bits are used. These drills are shorter than reamers so they work better for tighter clearance spots and they have 3 machined flats on the shank for extra drill chuck grippage. This set contains sizes 3/8"-3/4" as well as the corresponding pilot hole drill bits. Made in the USA by Norseman Drill & Tool.