Available here are Shear Nuts in Case Hardened Steel in Zinc Plated (CR-3) Finish. The Shear System is a high security permanent fastener. Both the Shear Nut and the Shear Bolt have a hexagon part which shears off at a predetermined torque. Installed using standard hex socket or spanner. Once installed, the Shear Nut leaves a tamper resistant cone. 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 the installation video. M6 - Hafren Shear Nut - Steel Zinc Plated - Box of 100