drilling rod spirals down into the earth.

The thread button bit, also known as a tap drill bit or a threading bit, is an essential component in the process of thread cutting. Its design incorporates a button-shaped projection at its end, which not only aids in the initial piercing of the material but also contributes to the accuracy and stability during the threading operation. The 'button' serves as a cutting edge, shearing off material as it rotates, gradually forming the required thread pattern.

...

Our complete stair tread line includes panels in a one-piece molded configuration for new or replacement steps; covered stair treads to replace deteriorating concrete steps; or stair tread covers designed to add slip and corrosion resistance to existing metal, concrete, or wood steps. Stair treads are available in a one-piece molded configuration engineered to exceed OSHA and other model building code standards for safety, strength, durability, and corrosion resistance.

...