Forged alloy jaws are spring loaded to grip all nuts 3/8" through 2-1/2" across flats. You get fast, one-hand ratcheting operation in tight spots. Tension plug holds head in any position up to 90° angle. Handle and shank are chrome plated. Stainless steel spring assures firm grip after positioning jaw on nut, pipe or tube. Telescopic shank on No. 1017 and No. 1019 is quickly adjusted to desired length and held there by spring loaded pin.