#8 x 1-1/2" Flat Head Assembly Screw, Square Drive Coarse Thread with Nibs and Type 17 Auger Point, Black, Box of 7 Thousand by Wurth

Square Drive Zip Drivers combine the Type-17 self-drilling point that pre-drills itself with the original Robertson Square Drive Recess for optimum performance. Nibs have been added under the head to help make this a true "One-Step" fastener. Simply put one on the driver bit and watch it pre-drill and self-countersink itself in most all types of wood.

Features:

• Screw Length: 1-1/2"
• 1-1/2” are threaded fully - all other sizes are threaded 2/3’s from bottom of the screw
• Case hardened finishes listed on right
• Uses #2 phillips drive bits