This company’s line of on-grade concrete drills includes two models—the 210B, which can operate within 6 in. of a corner and drill a ¾-in. hole 9 in. deep in about 15 seconds, and the 210B-2 two-gang system that also can drill 6 in. of a corner. Both feature a compact frame and are totally pneumatic. E-Z Drill Inc. 800-272-0121.