Correct option is B
A straight shank drill has a uniform cylindrical shank and is commonly used in drill presses, hand drills, and CNC machines. These drills are held in a drill chuck, which securely clamps around the shank using a tightening mechanism.
A drill chuck is a self-centering, three-jaw mechanism that grips the drill bit when tightened. It is mounted on the spindle of a drilling machine using a taper fit (such as a Jacobs taper or Morse taper).
· Straight shank drills are used for general-purpose drilling.
· Drill chucks provide a strong grip on straight shank drills.
· Commonly found in bench drills, hand drills, and machining centers.
· Drill chucks can be tightened using a chuck key or keyless mechanism.
