The tool works with all essential oil bottles including: 1ml / 2ml sample vials, 3ml / 5ml / 10ml / 15ml / 30ml essential oil standard caps ; and 5ml/10ml roller balls.Also great for replacing orifice and roller bottle caps without damage.These durable removal keys are made of sturdy ABS material with accurate holes to safely insert orifice and roller caps even on metal bottles. It isn't easy to scratch roller than the metal essential oil key tool.Stiff, aching, or arthritic hands won't hold you back anymore. Simple operation makes this roller ball key opener tool a must have for essential oil users.Custom logo is available.Call us for more info!