Long series drill bits are used specifically for adding depth to a hole or drilling in a space that's difficult to reach. Used by builders and electricians to cut through walls and ceilings to thread cables, long drill bits have their set place in a trade toolkit. There are, however, a wide choice of finishes or surface treatments available, (outlined below) which offer various benefits according to the job type. All types of long series drill bits must conform to BS 328-1:1993 standard. Parabolic - a flute shape that enables efficient chip removal to allow greater drilling depths in one pass

Long series drill bits are differentiated according to the material they're made from. The two most commonly found are HSS (high-speed steel) and HSCO (high-speed cobalt).Threaded shank - this type of drill bit works in conjunction with a threaded adapter on a handheld drill Length- Choose the length of your drill bit or set it according to the depth of the holes you'll be needing. There are lots of technical terms used when describing a jobber drill. We want to make it easy for you to find just what you're looking for, so we've put together a list of definitions of the most common terms. Precision - Some drill bits give cleaner results than others. Decide on the finish you want before committing to a product.

Material - it's important that you use the right tool for the right job. Choose your drill bit according to the material you'll be drilling into to ensure the best results.