The Model 110B on-grade concrete drill operates on the subgrade and fits a 3-ft. patch. The pneumatic system drills holes from 5/8 to 2 in. in diameter to a depth of 12 in. Designed for increased productivity, the patented roller bearing feed system eliminates carriage friction during drilling. The drill easily and quickly repositions, lifting handles on each side are positioned for proper leverage, and additional safety features enhance usability. E-Z Drill Inc. 800-272-0121.