Brake mount posts/bosses for V-brake brakes. The post portions are 8mm in diameter and about 16.5mm long. These are for V-brakes only. U-brakes/cantilever brakes use a 9mm diameter post. Thread lock is pre-applied to the portion that threads into your frame. * Threaded portion that goes IN YOUR FRAME: * M10 X 1.25 X 11mm   SOLD IN PAIRS NOTE: There are several sizes used in the bicycle world - be sure to measure before ordering.