s/n3117642

Information
has gloss	(noun) a bit for enlarging the upper part of a hole countersink bit, counterbore, countersink
has gloss	eng: A counterbore can refer to a cylindrical flat-bottomed hole, which enlarges another hole, or the tool used to create that feature. It is usually used when a bolt or cap head screw is required to sit flush with or below the level of a workpiece's surface (By comparison, a countersink makes a conical hole and is used to seat a flathead screw ). A very shallow counterbore, such as one machined on a cast part to provide a flat surface for a fastener head, may also be called a spot face.
lexicalization	eng: counterbore
lexicalization	eng: countersink bit
lexicalization	eng: countersink
subclass of	(noun) the cutting part of a drill; usually pointed and threaded and is replaceable in a brace or bitstock or drill press; "he looked around for the right size bit" bit

Media
media:img	CounterBores.jpg
media:img	Counterbore Cross-Section.png
media:img	Counterbore hole stainless steel.jpg