This formidablebike lock isreinforced with additional anti-angle grinder armouring material,proven to defeat multiple angle grinder discs! It features a heavy-duty 16mm boron hardened steel shackle encased in a tough TPE moulding, and a robust 25mm thick hardened steel high-security lock body to deliver cutting-edge defence against bike theft.TheStronghold®D16 MAXis secured using a precision engineered high-security 6-pin key cylinder, includinganti-drill, anti-pick and anti-bump technology with over 500,000 possible key differs. This restricted section key system comes complete with a personal key card to prevent unauthorised copying to provide an additional layer of security.Independently tested, theStronghold® D16 MAX easily surpasses the ultimateSold Secure PoweredCycle Diamondrating, the highest level of security for powered cycles! This rigorous attack test includes multiple heavy-duty tools and techniques including pry bars, bolt croppers and high-powered portable angle grinders.The Stronghold® D16 MAX. Maximum anti-angle grinder lock security for all high-end bicycles, e-bikes and e-cargo bikes.