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 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 money Easy to use, just insert them into the factory holes right left side pull out . Condition: new 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 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 .