The Delta 20 D kit is for new models that have guides that mount to the side of the saw frame parallel to the saw blade (See the "Kit Selector" below to determine which kit you will need). This all bearing kit uses our model 500 roller bearing guides to promote cooler running and longer blade life. The rugged 500 guides are perfect for general work and resawing. Extra wide conversion kit available to allow use of blade sizes from 1/2" to 1 1/4" See parts section.