Simpson Strong-Tie Structural Screw 5.6mm x 89mm Black SKU: 329111 MODEL: SDWS22312DBBR12 Error. try again later You've successfully joined the club $ 32 .98 pack of 12 Mitre 10 MAvailable at Mitre 10 MEGA stores. Variants Large washer head structural screw designed to fit Outdoor Accent pergola brackets. Features and benefits Large washer head fits cleanly into Outdoor Accent hex head washer for strong and fast connections. Double barrier coating for added durability. Patented saw tooth design for fast starts and easy install.