SRAM Flat Mount Disc Caliper Bolts Nothing quite holds your calipers to your bike like caliper bolts. If you're looking for the lightest bolts, then you'll want to go for titanium bolts. Mount your calipers with SRAM's Flat Mount Disc Caliper Bolts. They're light and sturdy, giving you optimal control and saving you weight. Features Material: titanium, stainless steel Length: 15, 17, 27, 37, 42mm | Sram | Flat Mount Disc Caliper Bolts | Titanium | 27Mm