"Go-Kart Drive Chains are sold in 10-ft. lengths and include one connecting link. Chain size is determined by measuring the pitch, which is the distance between the roller centers. 5/8in. would be #50 chain. 5/16in. would be #40 chain. 3/8in. would be #35 chain. This method of measuring meets ANSI standards. Application Drive chain, Overall Width in. 0.703, Roller Diameter in. 0.312, Chain Size #40, Chain Pitch in. 1/2, Distance Between Inner Plates in. 5/16, Tensile Strength lbs. 3,700, Pin Diameter in. 0.156, Weight lbs. per ft. 0.42. Ensures that you are using only grade A quality roller chain Pre-stretched at the factory to help eliminate 'gapping' or 'slop' associated with new roller chains that have not yet been stretched, making it easier to correctly size the first time Coated with a light oil finish for smooth operation and corrosion-resistance for longer life"