Our universal keys work with all essential oil bottles including: 1ml / 2ml sample vials; 3ml / 5ml / 10ml / 15ml / 30ml essential oil standard caps; and 3ml / 5ml / 10ml roller balls. Also great for replacing orifice and roller bottle caps without damage.The Tool slides easily under the neck of the roller ball and pops it up without any trouble.Save your fingers and Finger Nails! Stop using your teeth, knives or fingernails to remove roller bottle or reducer caps.A handy chain is included, which makes these keys easily accessible from your keys, carrying case or anywhere you want to attach them!Custom logo is available.Call us for more info!