R 408.14243 Ram props and blocks.

Rule 4243. A ram prop or block shall be provided and used at each hammer when dies are changed or repaired. The prop or block shall have a handle on the side. One of the following shall be used: (a) A wooden ram prop or block of hardwood and complying with not less than the specifications of table 1. The ends shall be square. (b) A steel ram prop of not less than 2 1/2-inch outside diameter by 2-inch inside diameter, or a structural shape of equal strength, with squared ends. (c) Other material which shall be of equal or greater strength as required for steel in subdivision (b). Figure for 408.14243