239-5223, OPTIBELT, OPTIBELT Timing Belt Pulley, Steel 100mm Belt Width x 12.7mm Pitch, 21 Tooth, Brand OPTIBELT, Number Of Teeth 21, Pitch 12.7mm, To Suit Belt Width 100mm OPTIBELT Timing Belt Pulley, Steel 100mm Belt Width x 12.7mm Pitch, 21 Tooth