The PNA Bollard Base makes bollard installation quick and inexpensive while producing a high-quality, finished appearance. Simply cast the bollard base in the slab, remove excess paste, and weld the bollard to the base. For new buildings, the base can be placed in a slab for future use without compromising slab integrity or being damaged by fork truck traffic. They come in round and square shapes in depths from 4 to 12 inches. PNA Construction Technologies. 800-542-0214.