Gives you a longer bit duration, reduces spinning & closing damage. Screw makes it easier and less tiring to drive. Reams hole in board buckles, reduce drag on stem and driving tool. Spiral notches in threads. Cut through fibrous materials & greatly reduce the torque required for the disc screw without affecting the clamping force. Type 17 serrated point starts quickly without walking. Reduces the need for pre-drilling. Reams hole in board buckles, reduce drag on stem and driving tool. | Big Timber 5lb Flat Head Star Torx Screws | Size 10 x 5"