My 3 sons and I installed 10 of these in about 2 hours. You will need a knife to cut open package and a phillips screw driver to put them in. The locking position is reversed meaning the switch is vertical when unlocked and horizontal when locked which is not typical but that's not a big deal.Also a cool feature is you can use a penny to open from the outside so in an emergency you can get in quickly.So far they seem of good quality
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