Insert bits are typically 25m (1″) in length and are designed for use in magnetic bit holders or power tools that have a magnetic chuck.
They can also be used in quick-release chucks.
Power bits
Power bits come in a variety of lengths from 50mm (2″) upwards and are designed specifically for use in quick-release chucks as they have a power groove on their body which engages with the metal ball bearings inside the quick-release chuck. This means that, compared with insert bits, they sit more securely in the chuck.
Double-ended bits
Double-ended screwdriver bits come in a variety of sizes, and are designed specifically for use in 3 or 4-jawed chucks.
They should not be used in quick-release chucks.
Socket screwdriver bits
Socket bits are used to drive bolts or nuts and are often used with socket wrenches. However, there are ‘socket screwdriver bits’ which have ¼” (6.35mm) hexagonal shanks and so can be used in cordless impact drivers to install or remove bolts.
Drill bits
Cordless impact drivers are primarily designed to drive screws, however they can also be used to drill holes, provided you use the correct bit. Drill bits with ¼” (6.35mm) hexagonal shanks can be used in cordless impact drivers.
The most common drill bits available with these particular shanks are usually standard twist drill bits, which are available in a variety of lengths and widths.