B Rate construction, depository safe. Electronic lock Dimensions. Outer: 20 in. L x 20 in. W x 30 in. H. Inner Door: 17.25 in. L x 19.5 in. W x 7 in. H. Weight: 176 lbs.. Mesa's MFL series depository safes are designed for protection against robbery as well as internal theft, allowing quick deposits and secure storage for cash and miscellaneous valuables without actual access inside the safe. They also protect money collections where immediate deposits are required.