Chicago-Latrobe 69881 Left-Handed Helix Jobber Length Drill Set 15pc 118deg HSS

15-Piece Left-Handed Helix Jobber Drill Set

This Chicago-Latrobe 69881 set contains fifteen high-speed steel drill bits with a left-hand helix. They are designed for drilling into hardened metals or removing broken fasteners where standard right-hand bits fail. The 118-degree point angle provides general-purpose starting accuracy on steel and cast iron. Bright uncoated finish suits standard workshop use.

Left-Hand Helix and Jobber Length Constraints

Left-hand rotation means these bits require a reversible drill or driver running in reverse; they will not cut in forward gear. Jobber length offers standard reach for through-holes but lacks the rigidity of stub-length bits in deep or interrupted cuts. Bright finish provides no heat or wear coating, so cutting fluid is essential in tough alloys. Unsuitable for production CNC tool changers expecting right-hand shanks.

118-Degree Point Angle Determines Fit

The 118-degree point is the deciding spec: it centres well on flat surfaces but walks on curved or angled stock without a centre punch. Choose this set only when the application demands left-hand cutting geometry at that specific angle. Buyers needing split-point self-centring, coated edges for high-speed drilling, or right-hand helix for conventional tapping should select a different configuration.