DeWALT
DeWALT 10-Piece Centre Drill Bit Set for Steel, 4mm Max, 4mm Min, HSS Bits
Part: DT5543-QZ
Ten-piece HSS center drill set for starting holes in steel components.
CK
CK 25-Piece Twist Drill Bit Set Set for Multi-Material, 4mm Max, 2.5mm Min
Part: T4519
25 twist drill bits for multiple materials, ranging from 2.5mm to 4mm diameter.