Comparison : Item # 41B9FH, No. 41 - 1/2" Pitch - Finished Bore Sprockets
Item # 41B9FJ, No. 41 - 1/2" Pitch - Finished Bore Sprockets
Item # 41B10FH, No. 41 - 1/2" Pitch - Finished Bore Sprockets
Item # 41B10FJ, No. 41 - 1/2" Pitch - Finished Bore Sprockets
Item # 41B10FL, No. 41 - 1/2" Pitch - Finished Bore Sprockets