Century Drill And Tool Black Oxide Drill Bit 31/64″ Reduced 3/8″ Pro Grade Mailboxes & Signs Maximum working pressure: 400 psi

Maximum working pressure: 400 psi at 73 F (degree Fahrenheit)

Double FKM O-ring - maintenance free blowout proof stem design

Keep people and pets out of the area during application

Flat countersunk head

hardness and friction reduction

Century Drill And Tool Black Oxide Drill Bit 31/64″ Reduced 3/8″ Pro Grade Mailboxes & Signs Maximum working pressure: 400 psiDesigned for drilling soft metal, mild steel, wood, plastic and PVC Manufactured from industrial high speed steel surface treated for high performance and long life Black Oxide drill bits offer 8 times Life Rating when compared to standard 135 degree point drill bits