TWIST to LOCK deadbolt keyless with Anti-Mislock Button on exterior knob which prevents you from locking yourself outside the door by inadvertent twist. This deadbolt TWISTING-to-LOCK keyless mechanical technology is the greatest invention of the lock industry in this century since the bolt locking keyless design invented by in 1919(Notice: cylinder can’t be replaced by it was designed as a part of twist-to-lock assembly); A DEAD-BUTTON works like a child safety lock： either can keep the door locked status as well as opened status as You Want, just push down DEAD-BUTTON which on the interior knob, No need an extra child safety lock which drilling more screw-holes or leaving glues on your door; NEVER FADE AND RUST & hardly wears out by lathe finish after 304 stainless steel casting ，this special surface finish technology makes the touching feeling of the lock delicate and smooth as silk.; lathe finish with no painting no e-plating no oil no baking varnish not like Zinc Alloy and lathe is more environmental for easy recycled use BUILT LIKE A TANK made of 304 stainless steel casting which is supper solid; Round, groove & cutting edge design looks more beautiful and more fashionable. EASIER INSTALLATION: This deadbolt lock can be installed by a 7-year-old child and only need a screwdriver. Easier than ordinary mechanical deadbolt lock
