0.220 x 12 Simpson Strong-Drive® SDWS LOG Screw E-Coat - Box (250) . The Simpson Strong-Tie® Strong-Drive® SDWS line of screws has been expanded to include longer lengths designed for log-home construction. These .220" and .195" diameter structural fasteners require less torque to install than comparable fasteners. The large diameter head pulls logs down easily, eliminating the need to use extra washers. 

Features: 

• Patented 4CUT™ tip that ensures fast starts, reduces installation torque and eliminates the need for pre-drilling in most applications
• Low-profile head design makes countersinking easy
• Serrated thread reduces log splitting and damage
• Large washer head provides maximum bearing area
• Deep 6-lobe recess reduces cam-out, making driving easier
• Size Identification on all SDWS screw heads