Well-made spacers! Forged and premium fittings. Installed on Tundra 2004. A few installation tips. Make sure to use the spoked wheel and drill to completely clean the mating surface. Spray brake cleaner. Use a light anti-seize coating on BOTH sides of the gaskets! Buy extended nuts from this seller and only use blue Loctite on factory bolts! It is necessary! Spend a few extra dollars to make sure your car is safe! Otherwise, the included nuts will only grab a few threads. Tighten spacer to 90 ft. lbs. To tighten the fronts, have a friend or a piece of wood (between the seat and the pedal) hold the brake pedal while you screw in the spacer. Do this and you will have no problems and you will have a successful installation.