?High Quality Material?100% high quality material.The Crank Arm is made of premium aluminium alloy,high strength and deformation resistance, durable for long time use.Good quality not only can provide a safer guarantee for your life,but also good materials can increase product life. ?170mm crank arm?The center distance between two holes is 170mm without any overlap of crank arm and chain ring bolt; Spindle interface type, Diamond Hole. ?Easy to Install?The left hand crank arm has standard precision cutting of hole, which ensures perfect fit to bike, easy to install.Exquisite workmanship, stylish and generous appearance. ?Applicable?A great replacement of crank arm; Suitable for road bike, mountain bike, folding bike, fixed gear bicycle, etc.The Crank Arm is a nice replacement for bike repair, compatible with many bike models. ?Quality assurance?Fine polish and great paint, colorfast and stylish; bike crank arm help ensure ultimate chain retention, increase service life.