This easy to install door lock helps to protect you and your family. The lock is made of specially treated steel to provide an extremely strong defense against break-ins. This lock can be used with dead-bolt or chain locks for an additional level of protection. Three sizes of rubber inserts are included for adjustments to most different style doors. This portable door lock is great for homes, hotels, or anywhere you want to feel safe and secure. Dimensions are 4 inches x 2 and one-quarter inches.