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The self-undercutting

#52 Heavy Duty Jobber Drill Bit (12) Stainless Steel Rivet / Steel Mandrel 5/8-11 x 8 Grade 8#52 Heavy Duty Jobber Drill Bit . Web construction is heavier than general purpose construction making it particularly suitable for cotter pin hole drilling and cross hole drilling in head of bolts. The heavy construction affords efficient drilling in stainless steel and other hard materials. The split point reduces the thrust requirements and minimizes walking.