14 Millimeters
New 14x1.5 Spike Lug Nuts 24PCS Black w/ Key for Chevy Ford Ram Jeep
A nice touch is the black edge trim that protects against bumps and dings.
6204-2RS Deep Groove Ball Bearings, ID 20mm x OD 47mm x Width 14mm Double Rubber
What I appreciate is the alloy steel hardware that comes included for convenience.