Diablo, 16 piece Speed Demon spade bit set. Set consists of 1 each 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 1", 1-1/8", 1-1/4", 1-3/8" and 1-1/2" spade bits. Diablo's Speed Demon spade bit range provides one of the fastest, most effortless hole drilling solutions on the market for fast, clean wood. The high-performance speed-tip design self-feeds for faster hole making when compared to traditional spade bits. An optimized curved paddle design enhances the chip evacuation process for more holes per charge. This range is impact strong for increased shank stability and durability in cordless and corded impact and drill drivers.