This Yale/Paddock Patio Lock is suitable for sliding doors and employs 6 high-performance bi-directional security hooks with anti-slam technology. It will accept a wide range of euro profile cylinders. The full stainless steel construction employs 6 high performance bi-directional security hooks with anti-slam technology. It has been performance tested to PAS 23 and PAS 24, corrosion resistance tested to BS EN 1670:2007 Grade 4, plus tested to a minimum of 100,000 operational lifespan cycles and comes with a 10 year guarantee. It has a 20 mm backset and is croppable: up to 220 mmcan be cropped from both top and bottom, however this means that the lock will no longer be PAS23 or 24 compliant if you remove any security hooks.