No.11 Black Double Ended Panel Drill

About this item:

• No.11 Black Double Ended Panel Drill
• Drill diameter 4.85mm to suit 3/16" rivet.
• 135° Split Point (crankshaft point)
• Split point is self centering reducing the need for end thrust.
• The 135° point provides superior performance when drilling harder steel materials.
• In most situations it will produce thicker chips minimising work hardening of the cavity.
• Faster penetration reduces abrasion and friction along the cutting edges.
• Black Finish Drills (also called blue finish) achieve their distinctive colour by steam tempering, a thermal process resulting in a porous tool coating.
• This surface helps to keep lubricant on the tool, particularly important on the cutting edges, thus reducing friction and cold welding.
• The result is increased tool life.
• Black finish tools are generally recommended for ferrous applications where the oxide layer aids chip flow and heat dissipation.