JT Drive Chains Type Z3 NN version Products of the highest quality, ie top technology using special steel alloys of the highest quality. Lower weight with maximum tensile strength. - Silver with attractive nickel-plated inner and outer flaps, thus less corrosion - Extra strong X ring chain open with rivet lock - X-ring sealed chains provide significantly better protection against premature wear - 4-way pressed chain pins for extra strong hold against lateral forces on the outer flap - Sturdy bearing collar for strength with permanent impact