Easily Permits Standoff Cap Assemblies to be Tightened or Loosened Can be Used for Either 1-1/2" or 2" (38.1 or 50.8 mm) Standoff Cap Assemblies C.R. LAURENCE SSW12 CRL Zinc Cap Assembly Spanner Wrench. The CRL Standoff Wrench provides a quick and efficient method of tightening and loosening the Cap Assembly of Round Standoffs from 1-1/2" to 2" (38 to 51 mm) in diameter. It is specifically designed to be used during installation of CRL Standoffs. The curved end of the Wrench fits around the Standoff Cap and into the slot in the edge, allowing the Cap to be easily tightened or loosened.. Part Numbers Variations: SSW12