Features and Benefits: * Size: 5/16 * Includes 3 in a pack * Spring loaded pilot pops the slug from the cutter * Low cost sheet metal hole-making * Made in the USA When you dont have a lot of holes to make, Blaircutters provide fast, accurate holes in materials up to 3/16 thick. Blaircutters are annular cutting tools that cut around the edge of the hole and eject the center as a slug. Because theyre hollow theres no dead zone as with twist drills. And unlike hole saws, that rip and tear through the material, they quickly give you a quality, virtually burr-free hole.