Woodys Dooly Carbide Wear Rods - 4in. DY4-6550 Dooly wear bars create four parallel traction lines for dramatically decreased darting and enhanced handling Each wear rod features two 7/16in. runners with center carbide 4in. carbide contains 90 degree carbide; 6in. and 8in. carbide carry 60 degree carbide Hardweld at front of wear rod and 1.5in. carbide pad at the back Durable 3/8in. - 16 mounting studs ensure secure fit