when used on wide beams the depth (h) of the standard cage may be increased if necessary so that the inclination of the sides does not exceed 25&de g; from the vertical. as a guide, the maximum beam widths for which the standard sling rod cage depths are suitable, are as follows: sling rod 8 10 12 16 20 24 30 36 42 diameter maximum 191 191 191 210 229 254 292 330 330 beam width a = 50mm for flange width 133mm or greater a = 38mm for flange width less than 133mm