Name: Self-Starting Step Drill Bit 7/8–1-1/8 in TiN-Coated HSS Unibit
Brand: IRWIN
SKU: 029-4439
Availability: InStock

Self-Starting Step Drill Bit 7/8–1-1/8 in TiN-Coated HSS Unibit

Item No 029-4439

Manufacturer IRWIN

Mfr. Item No 10239

$71.36

Min Order 5

Unit of Measure EA

Ships in 4-5 days

Description
Additional Details
Purchase History
General Ledger Coding

Some product details generated with AI assistance — verify specs before ordering.

The IRWIN Unibit 10239 is a high-performance self-starting step drill bit designed to produce clean, accurate holes in thin materials such as stainless steel, copper, brass, and plastic. Featuring a titanium nitride (TiN) coating, this high-speed steel bit offers superior heat resistance and up to six times longer life compared to standard bits. Its unique single-flute cutting edge provides maximum control and prevents walking, while the SpeedPoint tip ensures fast starts without the need for a pilot hole. The 7/16-inch hex shank provides a secure grip in drill chucks, making it an essential tool for electrical and HVAC professionals working with 1/2-inch and 3/4-inch knockouts.

Unibit Step Drill, Self-Starting, 7/8 - 1-1/8 in Diameter, 2 Steps, 1/8 in Step Depth, 1 Flutes, 7/16 in Shank, Hexagonal Shank, Speed Point, High Speed Steel, Titanium Nitride Coated, Applicable Materials: Stainless Steel, Copper, Brass, Aluminum, Plastic, Laminates

Packaging/Shipping Size and Weight: Length: 6" | Width: 8" | Height: 1" | Weight: 0.34 lbs

Product Details
Brand:	IRWIN
Series:	Unibit
Product Type:	Step Drill Bit
Material:	High Speed Steel (HSS)
Finish:	Titanium Nitride (TiN)
Size/Dimensions:	7/8 in to 1-1/8 in diameter
Number of Steps:	2
Step Depth:	1/8 in
Flute Count:	1
Shank Size:	7/16 in
Shank Type:	Hex
Tip Type:	SpeedPoint
Application:	Stainless Steel, Copper, Brass, Aluminum, Plastic, Laminates
Compatible Materials:	Stainless steel, copper, brass, aluminum, plastic, laminates
Color:	Gold
Size:	7/8 in to 1-1/8 in
Step Sizes:	7/8 in, 1-1/8 in
Flute Type:	Single Flute

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General Ledger Coding

General Ledger Coding is a value added service provided for you at no additional cost.

General Ledger Coding makes accounting easier by providing you with a calculated total of purchases based on your General Ledger Codes.

In addition to traditional General Ledger Summary provided at time of invoice, we can also provide quotes and order acknowledgements with General Ledger Coding as well. We also give you the ability to change a GL Code for one or all items for renovation projects that may utilize a single GL Code. We can also code any of our "extended inventory" items with your General Ledger Code at the time of quote, order confirmation and invoicing as well. We can code our item numbers directly to your GL Codes should our item categories not align directly with your GL Code Categories.

Please contact us if you wish to implement our General Ledger Coding feature.