Irwin 1-3/8 Inch x 5 Inch Self Feed Bit — SF138

The Irwin SF138 Self Feed Bit is designed for heavy-duty wood boring where clean, accurate large-diameter holes are required. Manufactured from heat-treated steel with a precision-angled chisel cutting edge for durability and consistent performance. The 7/16 inch hex shank fits most standard drills. Ideal for electricians, plumbers, and contractors drilling through studs, joists, and structural lumber.

• Brand: Irwin
• Part Number / SKU: SF138
• Diameter: 1-3/8 Inch
• Overall Length: 5 Inch
• Shank: 7/16 Inch Hex
• Material: Heat-Treated Steel
• Pilot: Feed Screw (includes spare feed screw)
• Application: Wood boring in studs, joists, and structural lumber

Available Variants:

• (1) Bit
• 12 Pack

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