"Used this as a replacement product due to my sister-in-law losing the keys to her front door. Euro locks are as easy as they come to change out - unscrew the single screw that retains the lock, turn the key until the lock barrel is aligned with the cylinder and then remove by pulling or pushing out. Reverse this to install the new cylinder and you're done. Less than 5 mins. Simples. The lock is of good quality and comes with 3 keys. You will pay more for this product at your typical DIY stores so it is more competitively priced at Screwfix."