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The 11F spacer is used on 4 and 5 section signal heads to relieve stress off the heads by making 3 point mounting. This will allow to get the full life out of your signals without warping over time. 2 castings must be ordered for each signal. Two options are available: 1. If 2 stiffener plates are used on the signal use the 11F2 for a single spacer or 32F2 for a pair of spacers. 2. If 4 stiffener plates are used on the signal use the 11F4 for a single spacer or 32F4 for a pair of spacers.