The taper countersink was the inspiration back in 2017 when ULTIMATECUT, a new product line for demanding results for trade and industry, was launched.

And with the new ULTIMATECUT countersink 4S, RUKO is now further expanding the high-precision tool series for professional applications.

Even at first glance, it is noticeable: The ULTIMATECUT countersink 4S has four cutting edges instead of the usual three, and if you take a closer look, you will also notice the second fundamental difference: the unequal division of the cutting edges with a specially developed cutting geometry.

But the new ULTIMATECUT 4S really shows the power behind it in practice.

It literally eats into the material and impresses with enormous material removal. Thanks to the four cutting edges, the forces are distributed, producing exceptionally smooth running and - an excellent countersinking pattern without disturbing chatter marks.

With a machining speed that is up to 3 times higher and a tool life that allows up to 3 times more countersinking with one tool, the figures of the internal RUKO test results also prove the exceptional performance of the new countersink.

Especially when used in cordless drilling machines, the new ULITMATECUT 4S even allows countersinking up to a diameter of 40 mm for the first time, which until now was exclusively reserved for stationary tools.

The new ULITMATECUT 4S countersink is available from specialist dealers in diameters from 10.4 to 40 mm.

In addition, the new countersinks are offered with RUKO nano Technology, or RUnaTEC for short, a coating specially developed by RUKO.