Irwin 11103 Step Drill Bit 6-18mm 7 Sizes Hss

Product Description

The IRWIN 11103 is a high-speed steel step drill bit designed for drilling multiple hole sizes with a single tool. It steps from 6 mm up to 18 mm in diameter, covering 7 hole sizes in one bit. The 5 mm step length provides clean, defined transitions between sizes. The round shank with three flats measures 3/8 inch in diameter and resists slipping in the chuck. The bright, uncoated finish indicates a general-purpose tool intended for everyday drilling tasks across a range of common materials. It is used by electricians, plumbers, HVAC technicians, and general tradespeople who need fast, repeatable hole sizing in sheet material and thin stock.

The IRWIN 11103 is suited for use in residential and light commercial trade applications where drilling through thin sheet goods is routine. Compatible materials include aluminum, brass, copper, laminate, mild steel, plexiglass, and wood. Its speed point geometry helps center the bit on the workpiece and reduces the need for a pilot hole. The single-piece construction and compact size make it practical for use in confined spaces typical of panel work, junction boxes, and pipe penetrations.

Key Features

• Steps from 6 mm to 18 mm, providing 7 discrete hole sizes in one bit
• 5 mm step length for clean, defined size transitions
• High-speed steel construction for durability in general-purpose drilling
• 3/8 inch round shank with three flats prevents chuck slippage
• Speed point geometry aids self-centering and reduces walking
• Works in aluminum, brass, copper, laminate, mild steel, plexiglass, and wood

Compatibility

Fits any drill or drill press with a 3/8 inch or larger chuck. Designed as a general-purpose step bit for use in thin sheet metals, plastics, and wood common to electrical, plumbing, and HVAC rough-in work.

Installation Notes

A licensed electrician, plumber, or HVAC technician typically uses step bits when sizing knockouts or penetrations in sheet metal panels and enclosures. Always de-energize electrical panels and shut off relevant systems before drilling into or near live equipment. Use appropriate cutting fluid when drilling harder metals to extend bit life. Secure the workpiece before drilling to prevent spinning or movement during the cut.