The ubiquitous Phillips-head pattern, on everything from
drywall to deck screws, and the nearly unstrippable square-drive
screws are two of the most common fasteners. The tip of Bosch’s newly engineered P2+R2 bit fits a number-2 Phillips, while flat spots along the sides match a number-2 square drive. Machined from high-strength steel for durability in both traditional and hex-drive chucks, the P2+R2 should mean less time spent changing bits on the job, and no worries about finding yourself without the right bit.
$5/15-pack; boschtools.com
They're called Robertson screws, after the guy who invented them. From Canada.