We carry the MDI WindMaster® Sign Stands and Bone Safety Stands. MDI stands are engineered using the highest quality components and thoroughly tested to ensure exceptional performance. Bases are equipped with springs that have strong initial tension to resist twisting and turning of sign in high wind gusts. MDI WindMaster® 4860 (large-1’6″ to ground) and 5018 (small-18″ to ground) are the stands we carry. All WindMaster® Stands and Bone Safety Stands are NCHRP 350-accepted and are the sign stands approved on the Maryland QPL.