there is no secondary tightening operation required which greatly reduces the overall cost of an anchor installation

or even if you’re just a do-it-yourself enthusiast

The nylon flange head adds stability in hollow surfaces

which is often a necessity when working on a wide range of products

5/16 Heavy Duty Jobber Drill Bit (6) 7/8-14 Grade 8 Hex Cap Screws Yellow Zinc Plated there is no secondary tightening5 16 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.