Irwin 10502ZR 3 Piece Step Drill Unibit Set Hss

Product Description

The IRWIN INDUSTRIAL TOOL CO 10502ZR is a 3-piece step drill unibit set designed for drilling clean, round holes in sheet metal, plastic, and thin-gauge materials. Each bit features a single-fluted cutting edge that reduces walking and produces rounder, more accurate holes than standard twist bits. All three bits are machined from high speed steel for durability through repeated use. This set covers a wide range of hole sizes in a single tool per bit, making it a practical addition to any electrical, HVAC, or plumbing tech's drill kit.

The 10502ZR set is suited for residential and light commercial service work where multiple hole sizes are needed without swapping bits repeatedly. Bit 1 steps from 1/8 inches to 1/2 inches in 1/32-inch increments. Bit 2 steps from 3/16 inches to 1/2 inches in 1/16-inch increments. Bit 3 steps from 1/4 inches to 3/4 inches in 1/16-inch increments. Electricians use step bits for knockout work in panels and enclosures. HVAC and plumbing technicians rely on them for sheet metal penetrations and PVC fittings.

Key Features

• 3-piece set covering 1/8 inches through 3/4 inches in stepped increments
• High speed steel construction for long service life
• Single-fluted cutting edge reduces bit walking and improves hole roundness
• Each bit replaces multiple standard drill bits for its size range
• Carded packaging keeps all three bits organized and protected

Compatibility

Designed for use with standard 3/8-inch or 1/2-inch keyed or keyless drill chucks. Suitable for drilling sheet metal, thin-gauge steel, aluminum, and plastic materials common in electrical, HVAC, and plumbing service applications.

Installation Notes

Step drill bits are typically used by electricians, HVAC technicians, and plumbers for field drilling in panels, enclosures, and ductwork. Always de-energize and lock out electrical panels before drilling near live components per NFPA 70E guidelines. Use cutting oil on harder metals to extend bit life and reduce heat buildup. Avoid applying excessive downward pressure, which can cause the bit to grab and spin the workpiece.