For the ultimate defense against bike theft, we trust the Hiplok AX1000 Anti-Angle Grinder Anchor and Swing Arm. As part of Hiplok's 1000 series, this anchor and swing arm feature Ferosafe, a graphene composite material, which is proven to take 20 times as long for angle grinders to cut through than standard D locks. The AX1000 fixes to brick or concrete surfaces, whether wall or ground, inside or outside, and has a 360-degree rotating base with pivoting arm so we can reach our bike from any angle. Hiplok recommends pairing it with their 1000 Series, Anti-Angle Grinder D Lock (D1000 or DX1000), but you can use it with any D lock that fits.