One standard aluminum, black hub cap and mounting gasket. Dress up your tractor, RV, or trailer wheels with black wheel hub caps. Hub cap includes oil window, vent plug, and side pipe fill plug, mounting bolts not included. Die-cast from aluminum alloy to help dissipate heat, resist breaking, warping and cracking. Bolt holes = 6, bolt circle = 4 1/2”, bolt hole size = 5/16”, fit = steer Replaces: Stemco️#343-4024 SKF️#1612 Approximate dimensions = flange OD 5 1/4" flange ID 3 1/2" height 2 5/8" One standard aluminum, black hub cap and mounting gasket. Dress up your wheels with a low-cost alternative. Hub cap includes oil window, vent plug, and side pipe fill plug, mounting bolts not included. Die-cast from aluminum alloy to help dissipate heat, resist breaking, warping and cracking. Bolt holes = 6, bolt circle = 4 1/2”, bolt hole size = 5/16”, fit = steer Replaces: Stemco️#343-4024 SKF️#1612 Approximate dimensions = flange OD 5 1/4" flange ID 3 1/2" height 2 5/8" Approximate net weight = 11 oz