Three cast aluminum or Nylatron sheaves on bronze bearings allow a gradual 90 degree turn for easy pulling through manhole openings. These blocks have a pulling radius of 24" (610 mm) with a 10,000 lb. (44,480 N) cable tension load capacity. The cable guide will sit on manhole edge, suspended with rigging in the manhole or fit in the jamb skid. The support bar is sold separately, and replacement sheaves are available.