Compact & Lightweight Sign Stands for Roll up Temporary Work Zone Signs, Warning Signs, and Regulatory Signs. Bone Safety SafeZone Stands are NCHRP-350 certified making them tested and approved for use on the national highway system. Catapult SZ-112 SZ-312 SZ-312-E SZ-412 SZ-412-2S SZ-412-FX SZ-412-S SZ-412-S-FX SZ-412-X SZ-460 SZ-460-2S SZ-484 SZ-484-2S SZ-RBS
