Buy the best Avantis Replacement Door Lock Gearbox Centre Cases and more Avantis Hardware here from GB DIY Store Ltd. Avantis Hardware makes no compromise to security and is considered to be the ultimate deterrent to unwanted criminals. Our range of hardware from the Avantis collection provides unique features – providing peace of mind to homeowners. All Avantis hardware is designed and manufactured in-house within the UK and is guaranteed to meet your security requirements. You can order Avantis Hardware online here and have the products you need delivered to your door. Or you can order online and collect from our physical store located in Mansfield with our online click and collect service.