Add protection to your facility and prevent damage. Posts feature a durable baked on powder coat in safety yellow to provide high visibility. Each post is made of 1/4" thick steel mounted on 3/8" steel plates that are pre-drilled with 3/4" holes for easy installation. The black HDPE post caps are included and can be removed to fill posts with concrete for extra protection. 4" posts plate size is 8"x8"3/8". 5" and 6" posts plate size is 10"x10"x3/8". Our machine guards provide superior protection for facilities and equipment. Create barriers between traffic areas and your valuable machinery. Machine gaurds all have a 8"x8"x3/8" plate size. Anchor bolts not included.