Protect your boat, trailer, or ATV with this innovative rust resistant design!Lock design protects shackle from cutting and sawing. Case hardended shackle. Precision pin tumbler mechanism resists picking.Locks trailers and trucks toegether securely. -2 keys included-1/4" diameter shackle 3/4" diamater body. ⚠ WARNING: This product can expose you to LEAD, which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.