tools for drilling through rock in tunnels, specifically designed ...

...

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.

...

One way that companies can offer customized products is through the use of group customization, or grp customization. Group customization allows customers to choose from a selection of pre-designed options and then customize those options to create a product that reflects their individual style and preferences. This approach gives customers the flexibility to tailor their purchases to their own tastes, while still benefiting from the convenience and ease of pre-designed options.

...