Stainless steel alternator belt tensioner upgrade for Volvo 240 244 246 GL DL This alternator Belt Tensioner is made from stainless steel. We had these parts made from stainless steel. The block and the bolt. We restore the Volvo 200 series and often this DYNAMIC DUO is not moving at all If you apply any sort of force you will have 2 parts in your hand. Broken at the point This set will not get rusty and will not cause any disruption while you are attempting to service your alternator water pump belt set .