Designed to hold a Spherically Mounted Retro-Reflector, Theodolite Sphere, Photogrammetry Sphere, or other Spherical Type Target or Accessory for a critical height and centerline. The edge may be used to contact inside edges to give a value of .800 away. Also when the sphere mount needs to be held in place magnetically.
1.5 SSM / MB FEATURES: 1144 STEEL, BLACK OXIDE FINISH – Heat-treated and hardened to R/C 53 – 55 (standard)
STAINLESS STEEL OPTION R/C 33-35