The yale y3 standard security nightlatch has been developed to offer customers a stylish contemporary lock combined with the performance and quality expected from yale it has a modern design and can be fitted as a replacement for the p77 traditional nightlatches with no additional chiselling required the latch can be deadlocked by the snib button internally and the snib function enables the latch to be held back this nightlatch is suitable for both left and right handed inward opening doors and