Hertel SDD40565129 Step Drill Bit Set 4 Piece

Product Description

The HERTEL SDD40565129 is a 4-piece step drill bit set made from high-speed steel with a black oxide coating. The set covers 24 hole sizes ranging from 1/8 inch to 1-3/8 inch, making it a practical solution for metalworking and multipurpose drilling applications. Each bit features a 3-flat shank to prevent slipping in the chuck. Right-hand cutting direction and conventional point geometry are standard across all four bits. Electricians, HVAC technicians, and sheet metal workers reach for step drill sets like this one when punching clean, sized holes through thin-gauge metal panels, enclosures, and conduit boxes.

This set is suited for light-gauge metalworking, electrical panel work, HVAC unit casing, and multipurpose hole-sizing tasks in trade and shop environments. The four bits in this set are divided by increment and size range: one 13-step bit covering 1/8 inch to 1/2 inch in 1/32-inch increments, one 12-step bit covering 3/16 inch to 7/8 inch in 1/16-inch increments, one single-step bit at 7/8 inch, and one 5-step bit covering 7/8 inch through 1-3/8 inch. Shank diameters are 1/4 inch and 3/8 inch depending on the individual bit.

Key Features

• 4-piece set covers 24 hole sizes from 1/8 inch to 1-3/8 inch
• High-speed steel construction for durability in metalworking applications
• Black oxide coating reduces friction and provides corrosion resistance
• 3-flat shank design prevents bit rotation in the chuck
• Step increments of 1/32 inch (small range) and 1/16 inch (mid range) for precise hole sizing
• Right-hand cutting, conventional point geometry suitable for sheet metal and multipurpose drilling

Compatibility

Designed for metalworking and multipurpose drilling applications. Fits standard 3-jaw chucks accepting 1/4-inch and 3/8-inch shanks. Appropriate for use on thin-gauge metal, sheet metal panels, electrical enclosures, and similar materials.

Installation Notes

Step drill bits should be installed in a variable-speed drill or drill press with the 3-flat shank fully seated in the chuck. Power down and disconnect any electrical panel or equipment before drilling into live enclosures. Use appropriate cutting fluid or lubricant on harder metals to extend bit life and maintain clean cut edges. Deburr drilled holes before installing grommets, fittings, or conduit connectors.