By decreasing your chains lateral movement, this excellent guide prevents unnecessary wear on your chain's teeth, which can lead to regular drops, impacted performance & expensive replacements. Easy to install with only a Torx 25 tool & no need to remove your crankset, this One Up effort works to make sure you only have to change your chain when the driving faces are fully worn out. Fit for use with Boost & Oval setups & made from a glass reinforced thermoplastic, this life & money saving attachment to your bike is an essential for prolonged riding.