When it comes to drills, there are two easily identifiable parts you need to know about – the shank and the chuck. The following information explains how drills and drill bits work:
The shank is the end of the drill bit that fits into the drill and is secured by the chuck. A round shank centers a bit in the chuck more accurately. The flat surfaces on a hex shank allow the chuck to grip the drill bit securely.
Quarter-inch hex shank bits are used on 1/4-inch impact drivers and can be quickly changed. SDS (slotted drive system) shanks are used for concrete drills and demolition bits and work specifically with SDS-Plus and SDS-Max rotary hammer drills.
The chuck is the part of the drill that attaches the drill bit. Most power drills for home use have a 3/8-inch or 1/2-inch chuck. Larger chucks come in 5/8-inch and 3/4-inch sizes, but are usually fitted on heavy-duty and industrial power drills and drill presses.
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