Bethea's UB-1-A Universal Roller is the solution to your search for a quality engineers sheave that is lightweight (9.4lbs), versatile, durable, and dependable. It can be intermixed with similar stringing blocks and mounting attachments manufactured by others, without affecting conductor sage and tension.
The quality of the UB-1_a roller is not surpassed by any roller of its type. Its aluminum parts are cast from high strength A356 alloy, heat-treated to the T6 condition, giving it the capability of withstanding rough treatment under adverse conditions while supporting heavy loads.
Features:
Profile machined groove for concentricity
Cast from A356 Aluminum and heat treated
Permanently lubricated to withstand -5F to 250F
Double shielded, deep groove ball bearings
Specifications:
8.1 – 13.0-lbs depending on the configuration
Working Load Limit: 2,500 lbs
Outer Diameter: 7” Block
Sheave (rim width): 3in
Width (throat): 3-1/8in
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nice block 
