Forge Fix-Shear-Nut-Zinc-Plated-M12-Forge Fix-10SHNT12-This-Forgefix-Shear-Nut-is-Zinc-Plated-It-provides-a-high-security-permanent-fastening-as-the-hexagonal-part-of-the-nut-shears-off-at-a-pre-determined-torque-leaving-a-totally-tamper-proof-cone-Ideal-for-security-applications-such-as-window-grilles-roller-shutters-external-seating-&-playground-equipment-Can-be-used-together-with-many-fixing-types-particularly-Sleeve-Anchors-&-Through-Bolts-Zinc-coatings-prevent-corrosion-of-th