JT drive chains type Z3 NN versionProducts of the highest quality, ie state-of-the-art technology using special top-quality steel alloys.Lower weight with maximum tensile strength.- Silver with appealing nickel-plated inner and outer plates, thereby less corrosion- Extra strong X-ring chain open with rivet lock- X-ring sealed chains provide significantly better protection against premature wear- 4-fold pressed chain bolt for an extra strong hold against laterally acting forces on the outer strap- Stable bearing collar for dimensional stability under permanent impact load