15 pieces. 5 masonry drill bits with impact-resistant carbide tip. For use in masonry, limestone, natural stone and artificial stone. 5 durable wood drill bits with centring tip. 5 metal drill bits made of high speed steel for precise hole drilling. Everything close to hand. Practical plastic case with a logical arrangement of the included accessories. Suitable for all power tool brands. When drilling metal, the use of coolant is recommended, e.G. Bosch universal cutting oil 2 607 001 409. Note on safety: please wear protective equipment appropriate for the application: metal drilling: protective glasses wood drilling: protective glasses and dust mask stone drilling: protective glasses, dust mask, ear protectors and protective gloves