SMALLEY - VS-137-S16 referenced Spirolox® Retaining Ring product produced by high technology. VS-137-S16 became irreplaceable of foundations. VS-137-S16 referenced product which is satisfy the customer's needs, offers advantages of quality and cost. It produced result of tests of laborotory for years. VS-137-S16 referenced product is an original piece of your foundation or machine, original parts makes your machine live longer.