Robust and sturdy breakthrough drill bits ideal set for creating breakthrough holes for laying cables and or pipes the drill bits are suitable for use up to a maximum length of 400 mm the set consists of 4 high quality sds plus drills in different lengths which allow for fast drilling progress and various hole sizes includes 1x diameter 10 x 160 mm 1x diameter 12 x 260 mm 1x diameter 14 x 260 mm 1x diameter 14 x 400 mm