The granit city x plus chain is one of the top of the range bike locks available from abus it is designed to keep your high value bike safe and protected against even the most brutal opening methods it is made up of 10mm hexagonal links made from hardened steel packed full of technology to protect against hitting pulling smashing and picking the bike chain is rated as a level 15 by abus the highest security rating they make and is also sold secure gold certified to protect the keyhole a