Brad-point drill bit

From KayakWiki

Brad-point drill bits are made for drilling holes with neat, clean edges and relatively flat bottoms.

A brad point bit can drill through a composite kayak leaving a relatively clean hole compared to what happens when you use a conventional twist drill bit. Brad points are also good for drilling holes for mortice and tenon joints in kayak making.

http://www.leevalley.com/images/item/Woodworking/Drilling/07j0107s2.jpg