The Otter Nail Bullet Head Bright Steel 100 x 4.50mm 5Kg is used for framing, flooring, finishing and cabinet making. They have a small rounded head that can be driven flush with the surface or countersunk below the surface. Otter Nail Bullet Head Bright Steel is generally is used where a good finish / appearance is a primary concern. - Used for framing, flooring, finishing, cabinet making where corrosion will not occur - Internal use - Has a small rounded head that is able to be driven flush with timber surface or countersunk below the surface - Generally used where the finish / appearance is a primary concern