How to use: firstly, insert keys into slots with straight edge facing away from the radio until it clicks, then repeat for the other slots, pull radio outwards using tool ring, once radio is removing, release keys by depressing spring tabs on either side of radio and pull outErgonomic design: unlike most stereo removal tools, these removal tools are designed with round shape and smooth appearance that allows you to easily remove tough stuck radio without causing your fingers pain, can save your much time and effortFits for: these radio removal tools are designed to remove the factory stereo from compatible with 1998+ , Mercedes, and vehiclesSturdy material: each radio key is made of sturdy metal, it is durable and does not bend or break during using, can serve you for long timePackage includes: package comes with 8 pieces radio removal keys for single and double DIN radio units, enough quantity to meet your different needs and replacement