Brake Caliper Screws Set Pro Bolt Race Spec screws allow additional use of safety wire. Another advantage of this DualDrive screw is the unique design of the screw head, which as a Outer, hex and socket allows the use of different tools. Made of durable 6AL4V grade 5 aircraft titanium, which offers the following benefits: - excellent corrosion resistance - exceeds the grade 8.8 for steel - 42% lighter than steel The kit corresponds to the original assembly of the brake caliper mounting screws.