Get hitched and lock 'er down.
You just dropped some serious coin for your brand new Kuat bike rack—now lock that sucker to the hitch using the Locking Hitch Pin. This pin works with a 1-1/4-inch rack in a 2-inch receiver and is compatible with a range of Kuat racks. The Locking Hitch Pin is available in either a 1-1/4 or 2in version. Two keys are included so you can keep one with your car keys and stash the other at home.
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I just purchased a Thule Vertex 9031 4-bike...
I just purchased a Thule Vertex 9031 4-bike hitch rack and don't want to pay the $$ to purchase their proprietary locking hitch pin. One side of the rack (that fits into the 2" receiver) has a 3/8" diameter hole and the other side has a 5/8" diameter hole. Would the 3/8" locking pin work without much slop and pin exposure (so it wouldn't be easily cut)?