Set Bolts can lock mirror into plate or be adjusted to allow for smooth movement with enough resistance for micro adjustment Locking block and bolts lock ball stud in place to prevent unwanted movement under the roughest condition 304 stainless hardware is corrosion resistant for years of reliable trouble free performance High optic glass with chrome plated backing provides superior image clarity and definition Convex surface provides super wide viewing range with added image stability Powder-coated cast aluminum for lightweight performance and durability Shatter resistant safety glass for maximum safety. HALO RA CAST CAN-AM X3