'tunnel drilling rock drill tools'

...

Furthermore, fiberglass chemical tanks are virtually maintenance-free and have a long service life. Unlike steel tanks, which require regular maintenance and repainting to prevent corrosion, fiberglass tanks do not need to be painted or coated. They are also resistant to mold, mildew, and bacterial growth, making them easy to clean and sanitize. As a result, fiberglass tanks have a lower total cost of ownership compared to other types of storage tanks.

...

Taper bits, also known as dovetail bits, are named after their unique shape that tapers from a wider diameter at the shank end to a narrower one at the cutting edge. This design enables them to create a gradual slope or angle, which is particularly useful for creating dovetail joints, staircase spindles, and furniture legs. The percentage indicated as taper% refers to the rate at which the bit narrows down, determining the steepness of the angle created.

...