Multipurpose alpen drill bit (one piece blister). -Diameter x length: 14.0x220 mm. -Application: high flexibility and precise drilling, even if the drill bits are changed in different materials. For rotary drilling in pavements, masonry, metal, wood and plastic. -Main characteristics: - Multipurpose. -Hard metal plate, very sharp edges, therefore also very suitable for metals. -Patented quadruple stepped profile, Quick removal of debris during drilling in masonry and concrete.