features stronger mechanical life,over 250,000 years of life,high quality and durability,giving you peace of mind and protecting your home from intrusion. Easy to install:quick to install,including instructions.It can be mounted from 1 3/8 in.(35 mm) to 2 1/2 in.(64 mm) in thickness and requires a 1 1/4 in.(32 mm) diameter hole,wood or metal door for mounting., Weight: 0.77933409617 pounds, Manufacturer: RITTRO