6MM CHAINRING BOLTS FOR 1X - 5PCSWe 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