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Levers and handles allow operators to make adjustments to machine processes, and are also used for clamping or workholding. Adjustable handles (AKA clamping levers or adjustable levers) are a nut or bolt interfacing with a semi-ratcheting wrench (the turning handle). Tension levers (AKA heavy duty adjustable handles or adjustable levers) perform a similar function but are a bit larger, allowing for frequent adjustments to heavy duty machinery. They typically feature a ball knob grip at the end. Cam levers and cam handles provide a clamping action; push down on an adjustable cam lever to tighten its clamp grip. Levers and handles are part of a larger supply of knobs and handwheels.