This 3-in-1 car safety hammer consists of stainless steel blade, broken window hammer and ABS housing. Stainless steel blades can cut off safety belts easily . Window hammers can shatter glass quickly, and emergency whistles can be used to call for help. The small size makes it easy to carry. It hangs on a key chain. It's necessary for drivers. 2 15/16" L x 1 5/16" W x 11/16" H.