Crystal Bars : For our clear burglar bars we use A- grade polycarbonate that is imported from Europe. The transparent burglar bar is 6mm in thickness and 35mm in width. The bars are bevelled on both sides so that there are no sharp edges that could cut you when opening the windows. They are UV coated on both sides to prevent them from discolouring in the direct sun. The burglar bars are totally transparent so you will have an unobstructed view and have the most stylish clear burglar bars that will never rust and will never require any maintenance. Unfortunately with all security systems none of them are 100% intruder proof. Burglar bars are only a deterrent and should keep out your intruder until your security company or police arrive at your house.