Simpson 2 1/4" 0° Inserted Plastic Coil, Full Round Head, Ring-Shank Nail PACK:7200 Pk 11 is a 3-Edge Spiral

11 is a 3-Edge Spiral Bit with Chipbreaker

120 is a 12 diameter 4 Flute Dowel Drill (Medium Series)

it reinforces connections where one lumber piece intersects another at a 90 deg

This virtually eliminates deflection under load due to material stretch

Profile Profile E2 for head (25x30x2mm)

Simpson 2 1/4" 0° Inserted Plastic Coil, Full Round Head, Ring-Shank Nail PACK:7200 Pk 11 is a 3-Edge SpiralModel No. S12A225DNB Coating Material. Type 304 Stainless Steel Penny Size. 7d Length (in.) 2 1 4 Head Diameter (in.) 0. 210 Shank Diameter (in.) 0. 099 Key Features Checker pattern on head blends with the wood grain, reduces glare from sunlight and accepts surface finishes Annular ring shank increases withdrawal resistance to provide a secure attachment Available in Type 304 and aluminum Compatible Tools Duo Fast: KDN50, RCN60, RCN70, CNP 60Y, CNP