Comparison : Item # 08B8, No. 08B - 1/2" Pitch - British Standard Sprockets
Item # 08B9, No. 08B - 1/2" Pitch - British Standard Sprockets
Item # 08B10, No. 08B - 1/2" Pitch - British Standard Sprockets
Item # 08B11, No. 08B - 1/2" Pitch - British Standard Sprockets
Item # 08B12, No. 08B - 1/2" Pitch - British Standard Sprockets