Hss-bi- cutting round holes in almost all machinable materials including metal l, cast iron, va and tool steels, copper, bronze, aluminum and wood, all sizes havenenefe 4 bi- and tool steels copper, bronze, aluminum and wood suitable for all sizes 4 38 mm can be used, the corresponding shanks provide easy and fast clamping in manual or stationary drilling machines, delivery without capacity Improved version for clearer understanding and better search visibility. Suitable for users seeking detailed and reliable product information.