Expand length is 1540mm/60.63inch ; Spring OD : 49mm ; Material Width : 8mm ; Material Thickness : 0.7mmInner Mounting Type : Hook ; Outer Mounting Type : HookThis is the chrome housed spring that returns the quill to the top after you have completed drilling.Used to all kinds of vacuum cleaner coil spring, volume tube coil spring, safe coil spring and so onChemical Blackening, the performance of the product form oxide film, isolate the air, prevent rustPay attention to safe when installing springs. Do not loosen the wire of fixed springs! Specification: Material : Spring Steel (60Si2Mn) Finish : Chemical Blackening Material Thickness : 0.7mm/0.03inch Material Width : 8mm/0.31inch Spring OD : 49mm Expand Length : 1540mm/60.63inch Inner Mounting Type : Hook Outer Mounting Type : Hook Package Content : 1 x Drill Press Spring Description: 1.The drill press quill return spring is good replacement for many existing quill spring drill presses, this is the chrome housed spring that returns the quill to the top after you have completed drilling.Used to all kinds of vacuum cleaner coil spring, volume tube coil spring, safe coil spring and so on. 2.Chemical Blackening, the performance of the product form oxide film, isolate the air, prevent rust. 3.Pay attention to safe when installing springs. Do not loosen the wire of fixed springs! When installing, install the spring with a fixed wire directly into the spring , and the wire will slide out.