Work benches and components thereof, namely, heavy duty fixed height sheet metal formed legs, step-less telescoping height adjustable sheet metal formed table legs, mechanical hand crank adjustable sheet-metal-formed table frames, motorized sheet-metal-formed table frame using independent linear actuators synchronized via a central electronic control system, dual slotted front and back steel upright tubes to attach shelving, arm components, bin rails, tool and part holders, drawers, tool boxe...