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 Radio There 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 apart See 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 Set Suitable: for /Opel CD30, CD30 MP3, CDC40 OPERA, CD70 NAVI, CD90 NAVI / C /Meriva a lot of time and money Easy to use, just insert them into the factory holes right and left side and pull out. Condition: 100% new and high quality Color: Silver Material: Metal Package Contents: 1 Pair(2Pcs) * Car Stereo Removal Tools Only 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.