The TWISTEP® Locking Bolt provides two benefits in one:

It provides an added degree of security and deterrent to theft.
It firmly attaches your TWISTEP® to your hitch receiver.

The accessory includes:

A chrome plated steel bolt
The lock and 2 keys
Mounting instructions
It's easy to install.
Model #180 - 5/8" diameter for 2" receivers
Model #181 - 1/2" diameter for 1-1/4" receivers
ADDITIONAL INFORMATION:

Manufacturer: OT, LLC

Type: Multi-Purpose Pet Step Locking Device

Size: two sizes as listed above