These Steeda plates have 4 bolts to spread the load across the entire strut tower. Billet 7075 aerospace alloy aluminum top plate: Twice as strong as 6061 aluminum used by other brands. 7075 Aluminum is actually stronger than mild steel. One-piece billet steel bearing plate. Not 2 pieces welded together like conventional plates. These plates have a 15% thicker bearing plate than conventional designs. 18% thicker top plate than other aluminum plates.  Teflon lined stainless steel bearing made in the USA. Largest uninterrupted adjustment range available. No need to disassemble the plates to switch between road racing and street settingsTruly independent adjustment of caster and camber.Adjust camber without disturbing caster settings, and vice versa.Strut height adjustable from 0.6" above to 0.3" below stock.2.6 lbs (40%) lighter per pair than competing 4-bolt plates. Lifetime warranty.