Specification Brand : uxcell BulletPoint1 : Head Style: Phillips Flat Head; Material: 304 Stainless Steel; Product Name: Self Tapping Screw BulletPoint2 : Weight: 54g; Package Content: 50(+/-2%) Pcs x Self Tapping Screws BulletPoint3 : Thread Size: 4.2 x 10mm/0.16" x 0.4"(D*L); Main Color: Silver Tone BulletPoint4 : Overall Size: 8 x 13mm/0.3" x 0.5"(D*L); Head Size: 8 x 3mm/0.3" x 0.12" (D*H) BulletPoint5 : Thread Pitch: 18G; Phillips Size: 3.5mm/0.14" Color : Purple DriveSystem : Phillips ExteriorFinish : Stainless Steel ExternallyAssignedProductIdentifier1 : 712662562498 ExternallyAssignedProductIdentifier2 : 0712662562498 GradeRating : Grade 2 ItemDisplayWeight : 10 ounces ItemName : uxcell 4.2mmx13mm Stainless Steel Phillips Flat Head Self Tapping Screw 50pcs ItemPackageDimensions_Height : 6.1 centimeters ItemPackageDimensions_Length : 2 centimeters ItemPackageDimensions_Width : 5.59 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : self-drilling-screws Manufacturer : uxcell ManufacturerGrade : Grade 2 Material : Stainless Steel MeasurementSystem : Imperial MeasurementSystem1 : Imperial MeasurementSystem2 : Metric MetalType : Stainless Steel ModelNumber : US-SA-AJD-121182 NumberOfPieces : 120 PartNumber : a15092100ux0783 ProductDescription : Features: 18G pitch, 8mm head diameter, stainless steel self tapping screws 4.2mmx13mm. Sheet metal screws have large threads for use in sheet metal sometimes also used in plastic, fiberglass, or wood. Pan heads are slightly rounded with short vertical sides. Sheet metal screws or tapping screws are designed to bind sheet metal to wood and sometimes fiberglass. Manufactured with a sharper, more pronounced thread that allows the screw to better tap or penetrate metal surfaces. Widely used in electronics, communication, electric power products, cultural goods, machinery, etc.