Dowel Accessory Kit includes everything needed for wood joining projects. Included in the 17-piece kit are (12) 5/16 In. dowel pins, (1) 5/16 In. brad point drill bit, (1) 5/16 In. drill stop collar, (2) 5/16 In. dowel centers and (1) hex key. The dowel pins are straight-grained hardwood with chamfered ends for easy installation. They are also grooved to accommodate excess glue during insertion. The fluted dowel pins swell on contact with water-based glue for an extra-tight fit. The doweling kit works with General Tools #840 and #841 doweling jigs. Dowel Size: 5/16 In. Material: Wood This product can expose you to chemicals including wood dust, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov. - Wood dust