Comparison : Item # 10B8, No. 10B - 5/8" Pitch - British Standard Sprockets
Item # 10B9, No. 10B - 5/8" Pitch - British Standard Sprockets
Item # 10B10, No. 10B - 5/8" Pitch - British Standard Sprockets
Item # 10B11, No. 10B - 5/8" Pitch - British Standard Sprockets
Item # 10B12, No. 10B - 5/8" Pitch - British Standard Sprockets