Hertel SDD43274604 Step Drill Bit Cobalt 9 Hole Sizes

Product Description

The HERTEL SDD43274604 is a cobalt step drill bit designed for drilling multiple hole sizes in a single operation without changing bits. The bright, uncoated finish and cobalt construction give this bit the heat resistance and hardness needed to cut through steel, stainless steel, sheet metal, and other hard materials encountered in trade work. The 3/8 inch shank with three flats prevents slipping in the chuck. With 9 hole sizes in one bit, it reduces tool changes on the job and keeps work moving efficiently. This is a professional-grade cutting tool suited for electricians, plumbers, HVAC technicians, and sheet metal workers who regularly drill clean, stepped holes through metal panels and enclosures.

This step drill bit is used in residential and commercial applications where precise, burr-minimized holes are required in thin to medium gauge metal. Common applications include drilling knockouts in electrical enclosures, conduit entry holes in sheet metal, and access holes in HVAC ductwork or equipment cabinets. The stepped design allows the same bit to produce holes ranging from 13/32 inch minimum to 1 inch maximum diameter, covering a wide range of trade-standard hole sizes in a single tool.

Key Features

• Cobalt construction provides superior heat resistance and hardness for drilling ferrous metals and stainless steel
• 9 hole sizes in a single bit, covering 13/32 inch to 1 inch diameter
• Round shank with 3 flats and 3/8 inch shank diameter prevents bit slippage in the chuck
• 1/8 inch step length allows controlled, incremental hole sizing
• Bright uncoated finish for easy visual inspection of cutting edge condition
• Compact profile at approximately 3.27 inches in length for use in tight spaces

Compatibility

Designed for use with standard 3/8 inch and larger drill chucks on corded or cordless drills. Fits any chuck that accepts a round shank with flats configuration in the 3/8 inch size.

Installation Notes

This bit is installed and operated by electricians, HVAC technicians, plumbers, and sheet metal workers using standard drill equipment. Always secure the workpiece before drilling and use appropriate cutting fluid or lubricant when drilling hardened or stainless steel to extend bit life. Ensure the drill is set to the correct speed for the material being cut, as excessive speed will shorten cobalt bit life on hard metals. Wear appropriate eye protection and follow applicable workplace safety standards when operating rotary cutting tools.