A Mechanics Length Drill is generally shorter in the flute than a Jobber Length Drill. This makes it sturdier for drilling through harder materials.
Mechanics Length Drills - General Purpose - 1/4" Reduced Shank - 9/32" to 1/2"
1/4" Reduced Shank Mechanics Length Drills (4" Length) are used for drilling holes larger than the capacity of a 1/4" drill chuck. Reduced shank drills should only be used for light to medium duty drilling applications as they do not have the torque strength of a straight shank drill. Reduced shank is not as hard as the body of drill to allow more flex and less breakage.
Mechanics Length Drills - Heavy Duty - 1/4" Reduced Shank - 9/32" to 1/2"
1/4" Reduced Shank Mechanics Length Drills (4" Length) are used for drilling holes larger than the capacity of a 1/4" drill chuck. Reduced shank drills should only be used for light to medium duty drilling applications as they do not have the torque strength of a straight shank drill. Reduced shank is not as hard as the body of drill to allow more flex and less breakage.