Mobile Drill calls the B37X a first class multipurpose drill rig ideal for the geotechnical, environmental and mineral exploration markets. With a 4-5/8-inch open center spindle, 13-foot stroke and various water pump options available, the compact B37X is a major partner for the safe and efficient use of drilling fluids. Pulldown 11,700 lbs. Pullback 15,700 pounds. Many other options available. Many popular mounts, including truck, trailer, tracks and skid.