Shop Fox D2845 Mortising Chisel Set - tools and more- shop fox mortising chisel set 4 ,Woodstock D2845 Mortising Chisel Set. Description: These Mortising Chisels are great for drilling square holes in wood with a mortising machine or a mortising attachment (not included). Set of 4 includes the following sizes: 1/4", 5/16", 3/8" and 1/2". This quality set also comes with a convenient plastic storage case. Specifications: 1/4" Wide.Amazon: delta mortising bitDelta Power Equipment Corporation 17-001 1/4-Inch Professional Mortising Chisel and Bit Set. 4.1 out of 5 stars. 49. $20.55. $20. . 55. Get it as soon as Wed, Jun 30. FREE Shipping on orders over $25 shipped by Amazon.