The HitchMate Receiver Lock is great for securing your bike rack or trailer to the hitch with a longer pin to fit the Class 5 hitch on the new Chevy/GMC HD truck line, or any hitch requiring a 3-5/8 in. span. New XL 2.5 in. hitch lock uses a higher strength steel to handle the load ratings associated with Class 5 hitches. Locks pin diameter is 5/8 in. and inside width is 3-5/8 in. and has an overall length of 6-7/8 in.. The weather-resistant lock features a covered key opening for added durability. It also comes with two keys for your safety and convenience. Use in place of standard pin and clip to prevent drawbar or accessory (bike rack/cargo carrier) theft. Made in the USA.