Halos clickster single speed freewheel in a top quality screw on freewheel discerning single speed rider that wants super quick engagement the body is high strength cr mo and the teeth are cnc cr mo that can accept both 332 and 18 chains the internals consist of a 6 pawl system with 72 point pick up and the thread is a 137 x 24t standard right hand thread available in 16 17 or 18t in black oxide only