Irwin Tools' 91148 drill bit delivers professional-grade performance for demanding drilling applications. Featuring a 3/4" diameter with a reduced 1/2" shank, this fractional steel bit accommodates standard drill chucks while maintaining the cutting capacity of a larger bit. The 6" length provides extended reach for deep hole drilling in metal and composite materials. Built with Irwin's precision engineering, this bit resists walking and delivers clean, accurate holes with minimal deflection. Ideal for metalworking, fabrication, and construction professionals who require reliable, consistent results on every job.