MXYOO U-Turn - 5/16-18 x 2 1/4 inch Flat Head Floorboard Thread Cutting Screws, Type F, T40 Torx, Black Phosphate (100 Pack)

HIGH QUALITY Thread Forming Screws that won't let you down. These Screws require a pre-drilled hole, but they are able to cut their own treads into thick material. Can be used in a wide variety of base materials.