Torx 6 Lobe Pan Head Machine Screws
18-8 Stainless Steel
Diameters available range from #2 to 3/8 inch. Torx head machine screws are often used with nuts as well as driven into tapped holes. In practice, they tend to be mostly available in smaller sizes and the smaller sizes are referred to as screws, or less ambiguously as machine screws, although some kinds of machine screw can be referred to as stove bolts.
18-8 Stainless Steel Torx is one such pattern that has become very widespread. The main cause of this trend is manufacturing efficiency: Torx and other types are designed so the driver will not slip out of the fastener as will a Phillips drive, since the driver is not inherently centered on the fastener.) A benefit/disadvantage of non-typical fasteners (depending on your point of view) is that it can be more difficult for users of a device to disassemble it than if more-common head types were used, but Torx and other drivers are widely available.
Machine Screws in 18-8 Stainless Steel offer the fastener industry standard of corrosion resistance, making the screw more durable, and suitable for harsh environments. Stainless Steel Torx screws in this selection feature a Star, or 6 lobe drive which helps prevent the screw from stripping.