a hand forged and quenched spring steel twist drill based on late medieval German finds,
nominally 4mm diameter with a fully functional, helical twist. and supplied with a hardwood handle, this design is the precursor of the modern twist drill. made in Sheffield England by Daegrad Tools
as a small aside Jacob Heller from Schmalkalden/Thuringen in Germany was given permission to start producing drills in 1583!.