When the radio is plugged in, the keys are designed to lock in place, allowing you to pull out the radio without using extra tools. Deleting the radio without the correct release button can be very difficult or can damage your unit. Radioactive Release Button Clears Most of Radio Installed on Rear Vaux RadioThere are radios with holes removed about 4 inch and 2 inch apart.If your radio has 1 or 2 hole radios on each side, separate about 2 inch apartSee DIN above.For some Vaux Hall you have to remove 4 small studs with the Hex Key (5/64),before you can insert a key.Type of Sheet Metal Tools: Sheet Metal Ruler,Sheet Metal Tools SetSuitable: for /Opel CD30, CD30 MP3, CDC40 OPERA, CD70 NAVI, CD90 NAVI /Corsa C /MerivaSave you a lot of time and moneyEasy to use, just insert them into the factory holes right and left side and pull out.Condition: 100% new and high qualityColor: SilverMaterial: MetalPackage Contents:1 Pair(2Pcs) * Car Stereo Removal ToolsOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.