Antenna Products' tower ladders are designed for 300 lbs. live loads and are supplied in welded 10-foot or 20-foot lengths of galvanized steel. The ladder steps are 3/4 inches diameter and on 12-inch spacings. The width is 16 inches as required by OSHA. The ladder may be fastened to a tower face with two U-bolt fasteners every 10 feet for attachment to braces, or to a tower leg with a tower leg adapter which positions the ladder 7 inches from the tower leg every 10 feet. The tower leg adapter comes in various sizes to adapt to carious tower legs. When ordering, a customer should state the tower leg diameter to the nearest 1/2 inch. The ladder sections are fastened together by two standard bolts. An overlap of two inches per ladder section should be considered when calculating the total ladder length.