Disston Company 571166 Hss Black Oxide Drill Bit 3/16x6

Product Description

The DISSTON COMPANY 571166 is a high speed steel (HSS) extra-length drill bit finished with a black oxide treatment. Measuring 3/16 inch in diameter and 6 inches in length, this bit is designed for trade professionals and skilled tradespeople who need extended reach in tight or deep drilling applications. The 135-degree split-point tip features four cutting edges that prevent walking on contact, eliminating the need for a center punch on most surfaces. Black oxide tempering reduces frictional heat buildup and improves chip evacuation, helping maintain bit performance through repetitive use across wood, plastic, wallboard, plywood, soft metals, aluminum, brass, and bronze.

This extra-length bit is suited for residential and light commercial applications where standard-length bits cannot reach, such as drilling through wall framing, conduit pathways, or deep structural members. Electricians, plumbers, and general contractors commonly use extended HSS bits when fishing wire, routing pipe, or boring through layered materials. The 571166 is rated for occasional use in stainless steel and other hard metals, making it a versatile addition to a general-purpose drill kit. It is sold individually on a carded retail package.

Key Features

• 135-degree split-point tip with four cutting edges prevents walking and starts drilling on contact
• 6-inch extra length provides extended reach for deep or obstructed drilling applications
• High speed steel construction provides durability across wood, plastic, soft metals, and occasional hard metal use
• Black oxide tempering treatment reduces friction and improves chip flow for cleaner, faster drilling
• Suitable for wood, plastic, wallboard, plywood, aluminum, brass, bronze, and occasional stainless steel use

Compatibility

Designed as an OEM-style replacement and general-use 3/16 inch extra-length drill bit compatible with standard 3/8 inch and 1/2 inch keyed or keyless drill chucks used in corded and cordless drilling applications.

Installation Notes

Insert the bit fully into the drill chuck and tighten securely before operation. Ensure the work piece is clamped or otherwise stabilized before drilling. When drilling metal, use appropriate cutting fluid to extend bit life and reduce heat. Operators should wear eye protection in compliance with applicable ANSI and OSHA safety standards.