Hertel SDD43274745 Step Drill Bit Hss 12 Sizes

Product Description

The HERTEL SDD43274745 is a high-speed steel step drill bit designed for drilling multiple hole sizes with a single tool. It features a 3/8 inch round shank with three flats to prevent slipping in the chuck. The bit covers 12 hole sizes ranging from 3/16 inch minimum to 7/8 inch maximum diameter, with a 1/8 inch step length between each size. A bright uncoated finish is standard. This bit is suited for electricians, plumbers, HVAC technicians, and other tradespeople who need to punch clean, stepped holes through sheet metal, electrical enclosures, panels, and similar thin-material substrates.

Step drill bits of this type are commonly used in electrical, HVAC, and plumbing rough-in work where multiple knockout sizes are required in a single session. The SDD43274745 is well matched to drilling sheet metal, junction boxes, electrical panels, conduit knockouts, and thin steel or aluminum plate. Its 12-step range reduces the need to swap bits when working through a range of conduit or fitting sizes in a single job.

Key Features

• 12 hole sizes per bit, from 3/16 inch to 7/8 inch diameter
• 1/8 inch step length provides precise incremental sizing
• High-speed steel construction for durability on metal substrates
• 3/8 inch round shank with 3 flats prevents chuck slippage
• Bright uncoated finish for visual step identification
• Single-bit solution reduces tool changes on multi-size knockout jobs

Compatibility

Designed for use with standard 3/8 inch or larger drill drivers and drill presses accepting a round shank with flats. Suitable for sheet metal, thin steel, aluminum, and similar thin-material applications common in electrical, HVAC, and plumbing trades.

Installation Notes

Step drill bits are installed by licensed electricians, HVAC technicians, and plumbers during rough-in and panel work. Always de-energize and lock out electrical panels before drilling enclosures or boxes. Use cutting fluid or lubricant on ferrous metal to extend bit life and reduce heat buildup. Apply steady, moderate pressure and avoid forcing the bit to prevent step damage or workpiece deformation.