Chicago-Latrobe
Chicago-Latrobe 69876 29-Piece Left-Hand Helix Jobber Drill Set
A 29-piece jobber-length drill set with left-hand helix bits made from high-speed steel and a 118-degree point angle
- TypeDrill Bits
- MaterialHigh Speed Steel
- 29-piece set covers a wide range of drilling tasks
- Left-hand helix extracts broken fasteners without damaging threads
- 118-degree point angle starts accurately on metal surfaces
- High-speed steel construction resists heat and wear
- Bright uncoated finish allows easy visual inspection of cutting edges
29-Piece Left-Hand Helix Jobber Drill Set
This 29-piece drill bit set from Chicago-Latrobe uses high speed steel for general-purpose machining. The left-hand helix design suits specific extraction or reverse-drilling tasks. It is aimed at mechanics and technicians who need a full range of jobber-length bits in one package. Buyers requiring coated bits for extended wear in abrasive materials should look elsewhere.
Left-Hand Helix Geometry
The defining specification is the left-hand helix flute direction combined with a 118-degree point angle. This geometry allows the bit to cut in a counter-clockwise direction, which is essential for removing broken fasteners or operating in reverse-driven setups. Standard right-hand drills cannot perform this function. The bright, uncoated finish is standard for the high speed steel material used.
Thermal Behaviour in Use
High speed steel generates heat during drilling, so cutting fluid or periodic withdrawal is necessary to manage temperature and preserve the 118-degree point. The uncoated bright finish offers no thermal barrier, making lubrication more important than with coated alternatives. Power draw and noise depend entirely on the drill motor and workpiece material rather than the bits themselves.
Highlights
- 29-piece set covers a wide range of drilling tasks
- Left-hand helix extracts broken fasteners without damaging threads
- 118-degree point angle starts accurately on metal surfaces
- High-speed steel construction resists heat and wear
- Bright uncoated finish allows easy visual inspection of cutting edges
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | High Speed Steel |
Questions about this item
How does a 118-degree point angle affect drilling performance in a jobber-length set?
The 118-degree point angle is a general-purpose geometry that centres well on flat surfaces and works across common metals without specialised cutting profiles.
What shank style do these high-speed steel bits use and how does it limit chuck compatibility?
Jobber-length bits have straight shanks sized to their flute diameter, so they fit standard three-jaw drill chucks but not SDS or hex quick-change holders.
What storage footprint should I expect for the 29-piece index case?
The set ships in a fitted metal index case that holds all 29 bits in labelled slots, keeping them organised and protected in a toolbox drawer.
Also in this aisle
People compared these
Same shelf, same checkout — eight coins and a 30-minute rate lock.
