The are a spacer, and they work well as intended.
Things to consider...
1: Spacers are illegal in many states.
2: depending on your rims, they might not be neccesary. The MOAB rims that come off the rubicons push your tires out the same amount that these spacers will push out a stoock Libby rim, except then there is no spacer, and therefore completely legal.
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-oooooo- ---Craig, L.O.S.T. #CT068103
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http://jeep.allgris.com
O||||||||O ---'02 Sport 4x4, 5-spd,
[]--------[] ---2.5" BDS lift, 245/75/16 MT/Rs, Moab Rims, Locked and Regeared!
[]_____[] ---The list got to long, go to my web site for more!