The FEIN 33901680390 Structural Steel Set is a comprehensive HM and HSS core drill bit set designed for demanding steel construction and installation work. It includes HSS NOVA 50 core bits with tough, impact-resistant cutting edges and HM ULTRA 50 carbide core bits for high cutting performance and long service life. Supplied in an L-BOXX 136 with accessory storage for organised, secure and convenient transport.