Irwin Industrial Tool Co 91148 Silver Deming Drill Bit

Product Description

The IRWIN INDUSTRIAL TOOL CO 91148 is a 3/4-inch Silver Deming drill bit built for heavy-duty drilling in metal, wood, and plastic. The bit is constructed from M-7 high speed steel, which delivers high resistance to abrasion during demanding drilling operations. A 3-flatted shank design provides a secure grip in the chuck and reduces slippage under load. Each bit measures 6 inches in overall length with a 1/2-inch reduced shank that fits all standard 1/2-inch drill chucks, including keyless models. The standard 118-degree point angle makes this bit versatile across a range of materials. Licensed tradespeople and skilled fabricators are the primary users of this tool.

This bit is well suited for applications that require creating large-diameter holes in metal and other hard materials. Common use cases include automotive repair, body shop work, and metal fabrication. The 1/2-inch reduced shank allows the 3/4-inch cutting diameter to be used in any 1/2-inch drill, eliminating the need for a dedicated large-capacity chuck. This package contains 6 bits, making it practical for shop stock or job site use where bit availability matters. The M-7 steel construction holds up during repeated use on steel plate, sheet metal, and structural stock.

Key Features

• M-7 high speed steel construction for high abrasion resistance during tough drilling
• 3-flatted shank reduces slippage and improves chuck grip
• 1/2-inch reduced shank fits all 1/2-inch drills, including keyless chucks
• Standard 118-degree point angle for use in wood, metal, and plastic
• 6 inches overall length, consistent across all Silver Deming bits in this line
• Sold in a package of 6 bits for shop or job site stocking

Compatibility

Designed for use in any 1/2-inch drill chuck, including keyless chucks, making this bit compatible with the majority of standard corded and cordless drills used in metal fabrication and automotive service environments.

Installation Notes

This bit is installed and operated by machinists, fabricators, automotive technicians, and experienced tradespeople. Before mounting the bit, ensure the drill is unplugged or the battery is removed. Seat the 1/2-inch reduced shank fully in the chuck and tighten securely before drilling. Use appropriate cutting fluid when drilling through hard metals to extend bit life and reduce heat buildup.