The Sharp Point & Thread Lets You See Them Fast & Too Whole Your Project Efficiently. The Bugle Head Allows For Speed And screw Grub Easy Countersinking. Premium Quality & Long Lasting-these Screws Are Created From High Quality Steel & Black Phosphate Ends That grub Screws Sizes Offer Better Corrosion Resistance Than The Commonly Composed Black Oxide. Applications & Uses-they Are Largely Used To Attach Wood To Wood And When Fitting Gypsum Board To Wood Studs. Suggested By Professional types Of Grub Screw Contractors, Builders & Diy. A Set Screw Or Grub Screw Is A Type Of Screw Commonly Used To Secure An Object Within Or Against Another Object, Normally Without Using A Nut. The Most Common Examples Are grub Screw Manufacturers Protecting A Pulley Or Gear To A Shaft.