Ring (crown) drills 

Bimetallic ring (core) RUKO drills HSS / HSS Co 8 Bi-Metall are used for work with hand drills and vertical drilling machines. When working on a vertical drilling machine, use only manual feeding.

Bimetallic core bit HSS with different teeth. When processing easily cutting materials, the teeth provide a more even cut and allow less effort. Due to less vibration and the development of heat during cutting, the service life may increase by three times. Usage: for non-alloy steel (up to 700 N / mm²), non-ferrous and light metals, plastics, gypsum, fibrous, plywood slabs and woodworking.

Bimetallic ring (crown) HSSE-Co 8 with small teeth. Well suited for metals. They provide a slowly move and allow you to spend less energy. Due to the less heat generation during cutting, the service life rises, especially when the metal is cut. Usage: for unalloyed and alloyed steel (up to 1000 N / mm²), Group VA steels, stainless steel, non-ferrous and light metals.

For the different range and material of the crown drills, the corresponding adapters are required:

- adapters for crown drills Ø 14-30 mm

- adapters for crown drills Ø 32-210 mm