Security Hardware for Cleats - T-Lock Security Hangers for Cleats - Extra Frame Lock for Wood Frames - 5 Pack with Wrench (Cleats Not Included) : Amazon.co.uk: DIY & Tools
T-Screw Security Picture Hanger Wrench - Set of 2 : Amazon.co.uk: DIY & Tools
T-Screw Marking Wrench - Each- T-Lock wrench is a Must for securing artwork | Picture Hardware
T-Screw | T-Head Security Screw for T-Lock picture security - 100 Pack with Free Wrench : Amazon.co.uk: DIY & Tools
Lock-In Security Hangers - Security Kit For 24-Inch Wood Frames - Picture Hang Solutions