Woodstock D3759 Doweling Accessory Set, 43-Piece 10 dowel pins - 1/4 inch 10 dowel pins - 5/16 inch 10 dowel pins - 3/8 inch Two each dowel centers - 1/4 inch, 5/16 inch and 3/8 inch; three brad point drill bits - 1/4 inch, 5/16 inch and 3/8 inch Three stop collars - 1/4 inch, 5/16 inch and 3/8 inch; hex wrench