... ,M2,M35,M42 Zirconium Coating, Black, Coffee Color HSS Double Ended Twist Drill BitsProduct Description:HSS Twist Drill Bits ... , Double EndedFully Ground4341,9341,M2,M35,M42 3.0mm-6. ... drilling holes for sheet metal screws or rivets.* for drilling thin sheet metals, steel sheet, sheet brass, sheet aluminum and plastic sheets. Double end drill ...