Durable 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 instructionsIt 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 surface mounting. Any installation:can be installed indoors or outdoors,left and right doorsEasy to install surface mount without modification Safety:Front door lock angle anti-shock with angle impact for added safety,you can lock it with a key to protect your home. colour:yellow Material:metal Size:About 90*58mm Package Contents: 1 set *door locks 2* key Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.