Comparison : Item # 16B11, No. 16B - 1" Pitch - British Standard Sprockets
Item # 16B12, No. 16B - 1" Pitch - British Standard Sprockets
Item # 16B13, No. 16B - 1" Pitch - British Standard Sprockets
Item # 16B14, No. 16B - 1" Pitch - British Standard Sprockets
Item # 16B15, No. 16B - 1" Pitch - British Standard Sprockets