Alpen sds plus drill bit (one piece blister). -Measurement, diameter x length: 8.0 x 450mm. -Quadruple stepped profile hammer drill bits with patented carbide insert. -High-performance drill bits for impact drilling in concrete, reinforced concrete, natural stone, walls and cement. -Accurate thanks to its excellent centering properties. -Robust thanks to the carbide tip and its modern vacuum hardening. -2 cutting edges.