Lock and unlock this stopper on a linear rail quickly without the use of tools. Linear motion stoppers are designed to positively lock on a linear rail through simple operation of the handle. Built-in spring provides constant clamping force. Ideal for clamping in tight areas with non-swiveling handle. The body is made from nickel-plated 1045 steel. The handle is made from nickel-plated 4140 alloy steel, quenched and tempered. The push bar is made from 1045 steel.