10-9X2 1/2 Phil Square Round Washer Deep Thread Wood 2 Type17 2/3 Thread Zinc White Head (Pack Qty 2,000) BC-1040DXRW217W

An externally threaded fastener with a dome-shaped head and an integrally formed washer; a recess that can accommodate either a Phillips or Square screwdriver; and a single lead thread. The shank has a reduced diameter and two chip cavities: cut out where the final several threads, ending at the tip, and a second cavity above the first but on the opposite side of the threaded shank The deeper thread design offers greater resistance to pull-out forces. The double chip cavity design is ideal when fastening into wood studs and further reduces the chance of splitting the woods. The head offers a greater bearing surface than a countersun