GRK 772691177247 8 by 1-Inch 1/2 Containing Equal to 100 Screws Trim Handy FIN, 1-Pack Bit guide FIN/TRIM #8 uses T-10 and #9 uses T-15 Self-Tapping, W-cut thread design and Climatek coated Reduces wood splitting Finishing Trim Head Screw ISO certified