3.5mm x 165mm Alpen EXTRA Long Series HSS Drill Bit
Alpen extra long series drill bits are a range of high efficiency drill bits for drilling extremely deep holes.
With this in mind, it is vital to remember that this type of hole drilling requires user intervention. Watch the cutting speed, even out the feed rate, use a coolant and frequently withdraw the drill bit to remove chip build up. Again, as part of the drilling process it is important to ALWAYS start the hole with a regular length jobbers drill at first. These extra long series drill bits will bend and possibly may snap under extreme duress drilling. Care and consideration is of the utmost importance. Remember, only a bad workman blames his tools.
A single 3.5mm drill bit which has an overall length of 165mm and a flute length of 115mm.
