Oasis Machinery DPA65 Mortising Attachment Kit Mortising attachment 1/4, 3/8, 1/2 & 5/8 chisels 1/4, 3/8, 1/2 & 5/8 drill bits 3 bushings (for 10, 12, 13 & 15") drill presses Quill diameters of 52, 55, & 60 mm Use with all 10" & larger drill presses