They are designed to drill and coutersink simultaneously, a wide variety of materials.

• Supplied with a HSS slow spiral drill bit.
• Fully adjustable, a hex key is supplied.
• Use at drilling speeds only.
• Not suitable for ferrous or non ferrous metals.
• Please ensure drill flutes are aligned with flutes of countersink.
• For replacement Twist Drills, use slow spiral type e.g. Refs 501/18 to 501/716.