Made of selected materials with 3.97 mm (5/32") carbon/Chrom steel balls,
143 mm(9/16") x 20 TPI Whitworth 
 

 
Diamond Pattern - available in sizes 3 1/4", 3 1/2". 3 3/4" and 4" with or without reflectors.
   

 
Pyramid Pattern - available in size 4" with or without reflectors
  

  Steel Pedal - available in size 3", with or without reflectors
 

     Plastic Pedal - Oval shaped engineered to ensure longer life & lasting value. "
Sizes available in 98mm, 95mm in various types.