The Chain Keeper Direct is a front guide to keep your chain running right where it belongs. This version of the Chain Keeper is designed to attach in place of a high direct mount front derailleur. High direct mount attachment points have a single bolt hole to the right of a long, vertical slot.The Chain Keeper Direct works with single chain ring drivetrains using a narrow chain. The chain block surrounds the chain as it meets the chainring and prevents it from skipping off. The Chain Keeper Direct was designed to fit a wide range of chainring sizes and chainline measurements. The slotted arm allows for 34mm of vertical adjustment, while the chain block has 20mm of lateral adjustment and full rotation.