[Hex Washer Head Self Tapping Screws]: The package comes with 100pcs of hex washer head self tapping screws in Thread Size: #12x5 (ST5.5x125mm); Thread Pitch: 1.8mm; Head Dia.: 8mm/ 0.31 ; Washer Head Thickness: 10.5mm/ 0.41 ; Head Thickness: 5.4mm/ 0.21 ; Screw Drilling Range(Plate Thickness): 1.75-5.25mm / 0.07-0.21inch [Sturdy & Durable]: Constructed with 410 stainless steel material with a black oxide finish, the hex washer head self-tapping screw is of strong durability, has no deformation, is not easy to rust or corrode, and has a long service life than ordinary screws. [Design]: The metal sheet screws are designed with an external hex drive style with washer, preventing slippage and ensuring a strong hold. The self-drilling design allows faster screwing into hardwood, easy to drill into, such as wood, sheet metal steel, aluminum, plastic, or other materials, reducing cracking problems. [Good Choice]: Hex washer head self-tapping screws are widely used for furniture, household goods, electronics, communications, power products, floor fastening, industrial, construction, machinery, equipment maintenance, and other DIY projects. [Installation]: Can be used without a drilling hole, good for metal-to-metal or metal-to-wood connections. For harder materials, it is recommended to pre-drill with a drill to make it easier to insert the screws. ASIN B0CZJG16TV Manufacturer DTGN Package Dimensions 8.66 x 5.51 x 1.57 inches; 3.57 Pounds