Comparison : Item # 06B8, No. 06B - 3/8" Pitch - British Standard Sprockets
Item # 06B9, No. 06B - 3/8" Pitch - British Standard Sprockets
Item # 06B10, No. 06B - 3/8" Pitch - British Standard Sprockets
Item # 06B11, No. 06B - 3/8" Pitch - British Standard Sprockets
Item # 06B12, No. 06B - 3/8" Pitch - British Standard Sprockets