We designed these bolts to be the best on the market. These single chainring optimized bolts have a 4 mm hex socket on the bolt and a 6 mm hex socket on the nut so no spanner is needed. These are 6 mm long, so they work perfectly with any bolt on single chainring that does not have threaded standoffs. COMPATIBILITY Any of our bolt-on Drop-Stop® chainrings with through holes 110 BCD and 130 BCD Works with other brands' single chainrings as well SPECIFICATIONS Weight: 5 bolts • 13 grams Material: 7075-T6 aluminum Size: M8 x.75 x 5 Torque spec: 7-8 NM tightening torque with light grease on threads only Made in the USA The Story Wolf Tooth was founded to design and manufacture precision cycling products that emphasize function, performance, and reliability to meet the needs of our fellow racers and riders. We are a group of cyclists in Minneapolis, Minnesota that spend a lot of time talking about bike components. Like most detail-obsessed riders, we're always looking for new products that could make our bikes lighter, faster, more versatile, or more reliable. We pride ourselves on delivering premium products of the highest quality.