Comparison : Item # SPLN-375-1000-2C, 3/8" x 10" Spline Shank 2 Cutter Carbide Drill Bit 5" Usable Length
Item # SPLN-375-1300-2C, 3/8" x 13" Spline Shank 2 Cutter Carbide Drill Bit 8" Usable Length
Item # SPLN-375-1600-2C, 3/8" x 16" Spline Shank 2 Cutter Carbide Drill Bit 11" Usable Length
Item # SPLN-438-1300-2C, 7/16" x 13" Spline Shank 2 Cutter Carbide Drill Bit 8" Usable Length
Item # SPLN-500-1000-2C, 1/2" x 10" Spline Shank 2 Cutter Carbide Drill Bit 5" Usable Length