2 1/2″ wide x 1 5/8″ deep x 3/8″ shackle diameter x 1 1/2″ shackle clearance. Cast stainless Steel body. Stainless steel shackle. I consider this to be one of the very first locks made. This lock would be considered an 826A. It again is chrome plated. “PAT. PEND.” is stamped on the base of the body. “R 138” is hand stamped on the base of the body. I believe this lock was used for testing. The slide that is in the lock is not plated.