The Hillman Group 370348 Plastic Anchor Kit Number 6-8 Includes Screws and Drill Bit , 1-Pack Kit Contents per Pack: #6-8 x 3/4" (100 pcs.), Pan Head Slotted Sheet Metal Screws (100 pcs.), 3/16" Drill Bit 3/16" drill size Works well in hard surfaces and hollow surfaces where no studs or beams are behind the surface