Lokar Anchor-Tight Blue Screw Into Pan Flexible Engine Dipstick with Lock for Ford 351 Transmission features a locking mechanism which eliminates expulsion of the dipstick handle under pressure. It has Teflon lined stainless braided outer housing and a flexible inner dipstick measuring cable. It is available for most engine applications in brite, black red and blue anodized. It is manufactured and assembled in the USA. It has a Lifetime warranty.