BM-6550…Full Mortise Brass and Steel Roll Top Desk Lock and Key Set. Steel lock body is 1-3/8 inches deep by 1-13/16 inches wide by 5/16 inches thick. Selvedge plate where the tongue of the lock comes out is 3-1/4 inches by 5/8 inches, includes the rounded ends. Brass catch plate with spring loaded door is 1-1/32 inches by 2-9/16 long to the round ends by 1-1/32 inches high Comes with 2 keys. Key is approximately 2-1/2 inches long overall. Sold by the set.