Specification Brand : uxcell BulletPoint1 : Thread Size: M5; Outer Diameter: 16mm / 0.62"; Height: 5mm / 0.2" BulletPoint2 : Material: Made of aluminum alloy, wear-resisting, and durable to use. BulletPoint3 : Type: Round and Flat; Color: Black; Package Content: 5pcs x Flat Knurled Nuts BulletPoint4 : Great for use in electronic applications and things that require quick adjustments. BulletPoint5 : Flat Knurled Nuts facilitate manual tightening, to open and close them without tools. Color : Black DriveSystem1 : Spline DriveSystem2 : Thumb ExteriorFinish : Aluminum ExternallyAssignedProductIdentifier1 : 0643345804065 ExternallyAssignedProductIdentifier2 : 643345804065 FinishType : black ItemName : uxcell Flat Knurled Nut - M5 x 16mm x 5mm Thumb Nuts Lock Adjusting Nuts Aluminum Alloy Black 5Pcs ItemPackageDimensions_Height : 14.1986 centimeters ItemPackageDimensions_Length : 0.7874 centimeters ItemPackageDimensions_Width : 9.8044 centimeters ItemPackageQuantity : 5 ItemTypeKeyword : thumb-nuts Manufacturer : uxcell Material : Aluminum MetalType : Aluminum ModelNumber : a20090900ux0196 NumberOfItems : 10 PartNumber : a20090900ux0196 ProductDescription : Feature: 1.Thin type knurled thumb nuts. This is an aluminum alloy flat knurled nut. 2.The circular nut with knurled is easy to assemble and disassemble. 3.Made of good quality aluminum alloy material, wear-resisting, and durable to use.