This is a genuine OEM sourced replacement part designed for use with Delta radial arm saws. It is an important part of the adjusting mechanism. This gear is made out of plastic and it is sold individually. To complete this repair you would need a screwdriver and a wrench set. • First you want to positions saw on its side • Punch o...Read moreut roll pin holding the gear on • Remove old gear • Install new gear on shaft • Secure gear with roll pin