... ,ground,metal box Jobber Length Metric Drill Sets Metric, Metal box Piece of DrillsSpecificationHSSHSS TiNM35131.5-6. ... -0521838-0721291/16-1/2" by 64ths838-0329838-0529838-0729 Drill Blank SetsHigh Speed Steel,Ground Pieces of DrillsSpecificationHSS131.5-6 ...