Maxtech CK-1118 Black Keyless 4 Dial Combination Sliding Bolt Lock, ideal to use on sheds, garden fences, and gates where a barrel bolt, paddlock, or hasp is used. This slide bolt is easy to use, set the dials to the pre-set combination (0-0-0-0), and use a sharp tool to insert it in the rest hode located on the right side of the main body. Push the tool and hold it , and now you can change the dials to the desired combination. After you change the code, release the tool and check the new combination. The slide bolt dimensions are 3-1/2" wide by 2" tall, the sliding bolt reciever is 1" wide by 2" tall, and the beefy barrel bolt has a 3/8" diameter.