Next, the drill bit should be centered on the rod and the drill should be operated at a slow and steady speed to prevent overheating Next, the drill bit should be centered on the rod and the drill should be operated at a slow and steady speed to prevent overheatingthreaded rod drill bit.Fiberglass covered grating is a long-lasting, molded fiberglass floor product that combines smooth, gritted, or checker plate and molded grating manufactured with any of our resin systems. It is the ideal choice when a 100% covered flooring surface is needed. Our fiberglass covered grating is often used in loading and storage areas with high foot and cart traffic. This is where a strong, level surface is ideal, and this is why fiberglass covered grating is ideal. If offers approximately 50% higher stiffness values than that of open mesh grating, and its standard grit-top cover assures secure footing. For more on fiberglass covered grating, click here.