KMC's HL1 chain is the most reliable in the industry, the perfect chain for maximum adjustability and great looks. Designed for use on single speed, internal gear, BMX, track and fixed gear bikes Half-link chains are ideal if you want to run a single speed on a bike with vertical drops. Their adjustability makes them ideal for perfect wheel positioning. Half-Link chains offer the ultimate in adjustability, allowing you to shorten the chain length by half a link each time, meaning you can achieve the perfect link without having to compromise. Super smooth and adjustable nickel-plated Supplied with connecting pin 1/2 x 1/8 - 100 links