Indoor or outdoor door bolt with a twist…a 4 number cam combination mechanism built right in. No keys to misplace! But, is it secure? You bet! User settable combination has over 10,000 possibilities. Perhaps best of all, this is the ultimate lock for keeping the 'tykes' out of your shop, lawn shed or other potentially dangerous areas. Includes 6 mounting screw. For enhanced security, mount with bolts (not included).