QuikDrive WSHL134S7#7 1-3/4" Subfloor Screw (2000) Simpson Strong Tie WSHL134S7 #7 1-3/4 High Low Phosphates #2 Square 8d EQUIV 2M Ribbed flat head with nibs for easy countersinking #2 square drive (driver bit in each box; replacement bit model BIT2S)