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"We are proud to be part of a well established partnership with Sealey - together we can offer great service, products and value for money"

10.4mm Ruko Ultimatecut 4S Flute Countersink HSSE-Co 5...
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10.4mm Ruko Ultimatecut 4S Flute Countersink HSSE-Co 5 102874EP£30.63£36.76
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Product Code: 102874EP

Diameter 10.4 mm, Total length 50.0 mm, 90Degree, 4 x Cutting Edges

Made from high-quality high-speed steel (HSS), the ULTIMATECUT countersink 4S BOOST has four cutting edges instead of three.

The distribution of the forces acting on the four cutting edges noticeably reduces the axial and radial forces and guarantees extremely smooth and material-friendly operation of the tool thanks to the uneven distribution.

The 4S BOOST countersink not only ensures a perfect countersink pattern without chatter marks, but also particularly effortless and material-friendly working with up to 50% time savings and up to 3 times longer tool life. Additionally, for the first time, the newly developed cutting technology even allows countersinking with diameters of up to 40 mm to be carried out with hand-held screwdriving and drilling tools.

The tool works with the same precision in drill presses as it does in CNC-controlled machining centers.

The 3-surface shank ensures a secure hold in the drill chuck and optimum power transmission.

Product advantages

best performance in stationary + manual use

significantly less feed force required

up to 3x more countersinking possible

up to 50% faster sinking

extremely smooth running

optimum countersink pattern without chatter marks

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Wednesday 28th October 2026