Finish nail is also known as bullet head nail, lost-head nail,headless nail or brad nail. It is a wire nail with a small head intended to be minimally visible or driven below the wood surface and the hole filled to be invisible. 

Nail Size			D	L	H	Pieces
			Shank Diameter	Shank Length	Head Diameter	Per lb
Penny	Gauge	Nominal		Nominal	Aprx.	Aprx.
4D 6D 8D 10D 16D	15 13 12 11 11	0.072 0.095 0.109 0.120 0.120		1-?" 2" 2-?" 3" 3-?"	0.105 0.135 0.155 0.162 0.162	630 288 196 124 87