Mortising Bit SetSimplify mortising tasks by using your router and an upcut router bit. This mortising bit set includes four spiral bits in common sizes used in furniture projects: 1 4", 5 16", 3 8", 1 2". When you purchase the set, you'll also get a free plan to build your own easy to use router mortising jig. Bit Set Includes: 1 4" Upcut Spiral Bit: 1" Cut Length, 1 4" Shank 5 16" Upcut Spiral Bit: 1 1 8" Cut Length, 1 2" Shank 3 8" Upcut Spiral Bit: 1 1 4" Cut