These solid brass screws have rolled well-defined threads along most of their shank, have strong necks, and machine-cut, slot-drive heads.

Round head screws ahve a flat underside to the head.

As with all brass screws, a countersunk pilot hole is recommended before installation.

The screws come with a clear lacquer coating to help prevent oxidation and discoloration. 

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NOTES

GAUGE - The use of the heritage descriptor gauge is derived from the wire gauge the particular screw size is formed from and dates to the 18th century.

There exist several WIRE GAUGE STANDARDS which are probably a consequence of the clumsy fractional inch measurements still needed in world regions which use feet & inches.

There is a metric wire gauge standard but little used because of the simplicity metric weights & measures offers. Despite this, metric measured fasteners may still borrow the gauge system because of its ubiquity.

These screws are made principally for the US market hence the lengths specified are approximate conversions of inch sizes to mm.

I will add shank major and root diameters as they become available.