SJ62521 – 21mm 60° Countersink Burr, 6mm Shank Single Cut for Steel & Cast IronThe SJ62521 is a 60 countersink carbide burr with a 21mm head and 6mm shank, built for chamfering, deburring, and countersinking in heavy duty materials. The single cut fluting delivers smooth control and a clean finishideal for prepping holes, breaking edges, or cleaning up after drilling in steel, stainless, and cast iron. Whether you're chasing a clean seat for a fastener or knocking off a burr that doesnt belong, this burr gives you precision