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The 27552 is a 5/16-18 wing nut. It is used with the 27551, a 5/16-18 x 3.0-in. stainless-steel bolt, to mount the 31021 AP200 Scrub Module to a vertical pipe. Alternatively, two of the 27522 nuts are used with two of the 27551 and a single 27550 mast clamp to secure the 34334 mount to a vertical or horizontal crossarm.