They can be installed with a standard socket or spanner then, once installed, you are left with a tamper resistant cone. Thread size x thread pitch -.
M12 12mmØ Galvanised Hex Set Screws Hot Dipped Metric Fully Threaded Bolts 8.8
SECURITY BUTTON HEAD A2 STAINLESS STEEL HEXAGON HEX SHEAR BOLTS ANTI VANDAL NUTS
SECURITY BUTTON HEAD A2 STAINLESS STEEL HEX SHEAR BOLTS ANTI VANDAL THEFT NUTS
M7 (7mm) METRIC HEXAGON HEX NYLOC NYLON INSERT LOCKING NUTS BRIGHT ZINC PLATED
M6 6mm A2 STAINLESS STEEL SOCKET CAP SCREWS METRIC COARSE HEX ALLEN DIN 912
