Available here are Kinmar® Permanent Bolts in Case Hardened Steel in Zinc Plated (CR-3) Finish. Kinmar® fasteners are the ultimate high security patented one-way bolt. This patented permanent bolt requires a matching driver socket for installation giving you guaranteed torque levels and can be re-torqued if required. Not governed by a shear point and leaving no unplated surfaces, it leaves a clean smart finish. This item is sold in a box quantity of 100. This is not a stock item therefore please allow 3-5 working days for dispatch. As this is not kept as a stock item, this is non-returnable. Click Here to view installation video. M8 x 40mm Kinmar® Permanent Bolt - Steel Zinc Plated - Box of 100