7/16 Cobalt Heavy Duty Jobber Drill Bit

1/4 Cobalt Heavy Duty Jobber Drill Bit

1/4 x 3 Mushroom Spike Zinc Plated (100)

5/8-11 x 8 Grade 8 Hex Cap Screw Yellow Zinc Plated

#31 Heavy Duty Jobber Drill Bit (12) 7/8-9 Hex Cap Screws 18-8 Stainless Steel 7/16 Cobalt Heavy Duty Jobber#31 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.