1/4" (6mm) Bronze Double Block or Cheek Block
These bronze blocks are an economical way to have a traditional look. This double double block can also be mounted flat as a double cheek block.
Here is the manufacturers description:
This classic design has stood the test of time. The high strength to weight ratio and simple construction gives years of trouble free service. You will often find them in use after more than 30 years! They feature hollow rivets for lightness and tough plastic sheaves that provide a good bearing surface allowing easy rotation under a range of load conditions.