Bulk up your tool room with this professional-grade 150-piece Square/Robertson #2 screwdriver bit from Reinforced Door Store. Each bit is 1 inch long with a 1/4-inch hex shank, compatible with both power tools and manual drivers. Crafted from tool grade S2 alloy steel and finished with a sandblasted gray coating, these bits offer exceptional durability, wear resistance, and corrosion protection. Proven Performance from Our Best-Seller: These are the very same bits featured in our top-rated Reinforced Door Screw Kit, a best-seller loved for turning standard doors into kick-resistant barriers. If you've experienced their reliability in door reinforcements, you'll love having 150 on hand for everyday tasks like construction, maintenance, assembly, and tool bins. The bulk set includes a sturdy plastic container for easy storage and quick access. Ideal for contractors, tool shops, serious DIY enthusiasts, and workshops needing a reliable supply without the premium price tag. With heat treatment to 58+ Rockwell hardness and a no-frills design that cuts out superficial features, you get industrial-strength bits at pennies each, saving you time and money when restocking.