works good and saved me from having to change out the cylindersThis key is not just to remove and insert lock cylinders, it's also the perfect master key.Great for facilities people and office managers.Needed for work, exactly as advertisedWorks perfectly!GoodWorks on some Timberline TA locks but not others for removing the cylinder. The ones that are on desk drawers cannot be removed with this device, however the ones I have on my cabinets I have no trouble with. See picture for the two types of locking mechanisms I'm referring to. The square lock in the background works with this tool, tube rotating lock in foreground doesn't.Worked great !arrived in a timely manner, and as described.