When the radio is plugged in, the are designed to lock in place, allowing you to pull out the radio without using extra . Deleting the radio without the release button can be very difficult or can damage your unit. Radioactive Release Button Clears 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 Metal : Metal Ruler, Metal SetSuitable: for /Opel CD30, CD30 MP3, CDC40 OPERA, CD70 NAVI, CD90 NAVI /Corsa C /MerivaSave you a lot of time and moneyEasy to , just insert 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 Only the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.