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Example of a combination drive system. At center, a Torx T25/slot Dual Drive screw; at left, a 3 ⁄ 16-inch (4.8 mm) flat-blade screwdriver; at right, a T25 screwdriver. The screw will accept either screwdriver. Some screws have heads designed to accommodate more than one kind of driver, sometimes referred to as combo-head or combi-head.
Twist drill bits are available in standard lengths, referred to as Stub-length or Screw-Machine-length (short), the extremely common Jobber-length (medium), and Taper-length or Long-Series (long). Most drill bits for consumer use have straight shanks. For heavy duty drilling in industry, bits with tapered shanks are sometimes used. Other types ...
Special combination drill-driver bits and adapters let an operator rapidly alternate between the two. Variations include impact drivers , which provide two types of 'hammering' force for improved performance in certain situations, and "right-angle" drivers for use in tight spaces.
Many screws used in electrical applications (for example, a typical NEMA 5-15R, breaker screws, and conduit screws) use a combination of a slotted/Phillips/Robertson screw head. A few tool manufacturers make bits to engage this screw head better than the traditional Phillips allowing for more torque before camout, for example, the C1 and C2 ...
Drill bits of the less routinely used sizes, such as 2.55 mm, would have to be ordered from a specialist drill bit supplier. This subsetting of standard sizes is in contrast to general practice with number gauge drill bits, where it is rare to find a set on the market which does not contain every gauge. There are also Renard series sequences of ...
Large drill bits can have straight shanks narrower than the drill diameter so that they can be fitted in chucks not able to chuck the full diameter. Such a drill bit is called a reduced-shank or blacksmith's drill. For example, this allows a 1 ⁄ 2-inch (13 mm) bit to be used in a pistol-grip drill's 3 ⁄ 8-inch (9.5 mm) chuck.