It´ss the small hollow chamber that defines our new WCD Hardcore Tool. Designed to fit any bag or pocket, this multifunction skate tool securely stores everything you need for a quick pit stop inside its ergonomically shaped, anodized aluminum handle. 4mm Allen key, T25 Torx key, bearing removing tool, Philips head, and slot screwdriver, all in one. Simply slide the correct tool into the magnetic slot, fix whatever needs to be fixed, and continue your ride. Sometimes it´s just the right key being the key to success.