5J6939HD cutting edge,end, L/H Fits CaterpillarOne New Aftermarket Replacement Left Hand Cutting Edge End Bit for Caterpillar (Cat) D5 and D6 Series Dozers This heavy duty left hand (L H) end bit is a bolt on replaceable wear part that mounts to the outer left end of the dozer blade cutting edge assembly. End bits protect the blade corners and provide the primary cutting contact at the edge of the push stroke, withstanding abrasive forces during earthmoving, grading, and land clearing operations.