Adjustable Handles are also known as clamping handles, use these standard adjustable handles for applications involving frequent positioning, tightening, and holding adjustments. Lift the handle to rotate freely; then release the handle to engage and tighten. Threaded-stud handles mount into a threaded hole. Plastic handles are a lightweight alternative to metal. They resist oil, grease, and solvents. Zinc handles have good corrosion resistance. Stainless steel studs are more corrosion resistant than steel studs.