Irwin IRW15101ZR Step Drill Bit 1T 13 Hole Sizes 1/32" Increments

The Irwin IRW15101ZR is a step drill bit, type 1T, cutting 13 hole sizes from 1/8 inch to 1/2 inch in 1/32 inch increments.

The 1/32 inch increment is the specification that distinguishes this from the coarser step drills in the range, and it is a genuinely different tool. Thirteen sizes between 1/8 and 1/2 inch means the steps are close together — which gives the ability to hit a specific size precisely, rather than settling for the nearest step. For electrical work where a hole must match a connector, a grommet, or a cable gland exactly, that precision is the whole point.

The trade is step height. Closer steps mean shorter steps, which limits the material thickness each step can cut through cleanly.

Step drills exist because twist drills are poor in thin material. A twist drill grabs as it breaks through sheet, tears a triangular hole, and can snatch the workpiece out of the operator's hands. A step drill self-centres, cuts progressively, and leaves a round hole with a deburred edge.

One bit covering 13 sizes also means no bit changes and no pilot holes across a range of work.

The 1T designation is Irwin's size series identifier.

Applications include electrical panel and enclosure work, control cabinets, sheet metal, HVAC, and autobody.

Users include electricians, panel builders, sheet metal workers, and HVAC technicians.

Brand

Irwin

SKU

IRW15101ZR

Category

Power Tools & Accessories

Weight

0.15 lbs

Dimensions

14.00 x 2.50 x 0.50

Price

$45.00

Availability

In stock

Rating

3.69 / 5.0