KMC 1/8" half link
This extremely handy little link will add or subtract 1/2 a link (1/2") from your chain, allowing you to move the axle 1/4" forward or backward to dial in chain tension or slam that rear wheel.
• for use with 1/8" chains only
• available in two versions - black works with all standard 1/8" KMC chains, nickel plated works with K710 and K710SL chains
Use in conjunction with a master link on your K710 or K710-SL chain to prevent creating a weak spot.