A Revolution In Drop Arm Barrier Technology.Nasatka Barrier Inc. (NBI) has revolutionized Drop Arm (Crash Beam) Barriers with the NMSB XII, the highest security drop arm unit available worldwide. The NMSB XII has received the DoS K12/L3 crash certification (15,000 lbs. at 50 mph) with remarkable results. Our fortified “sling shot” concept provides an ideal stopping mechanism for maximum perimeter security. After impact, the test vehicle was propelled backwards up to 6 ft! The U.S. State Department representative onsite to witness and certify test results stated that the test was one of the most remarkable DoS had ever witnessed. The NMSB XII can be hydraulically and/or manually counter-balance operated. This barrier can also be built as a horizontal swing arm or slide gate.