The JCS Hi-Torque Tamtorque tamper-proof clamp is a great anti-tamper fixing for attaching a high-risk sign faces onto signposts where theft or vandalism may be a problem. Suitable for posts between 55mm to 340mm, this clamp can be used in a multitude of places.The ultimate clamp for all types of signage, especially smart signs, and ANPR cameras which are expensive and could be a target of theft. Corrosion Resistant - Made from high-quality stainless steel. Vandal Resistant - Tamper-proof design making it extra secure and allows expensive equipment to be safely & securely mounted. Extremely Strong - Designed with unrivalled strength tested in real-world conditions, withholding in excess of 1.5 tonnes trying to pull it apart. Re-Usable - Clamps are good to be used again and again even after long periods of use. Anti-tamper Bolt Head - Designed with anti-tamper bolt head preventing unauthorised removal or alteration.