Xpanda brick style burglar guards are zinc phosphate and epoxy coated to a high gloss, scratch resistant finish for additional anti-rust protection. Unique, one-way, tamperproof security screws for steel are supplied with each burglar guard. Burglar guards are available in seven sizes to fit steel window frames. Burglar guard sizes given are between fixing points. Please see fitting instructions below for guidance on choosing the correct size burglar guard.