These self-tapping screws were developed specifically for pocket-hole joinery.
The #6 screws have fine threads and are best suited to hardwoods. The 1" #7 (25mm) screws have coarse threads best for softwood, particleboard, plywood, etc.
Available in packages of 100 or 500 screws.
Square-recess drive. Cut thread. Finish may be bronze or zinc, depending on supply.