Specification Brand : uxcell BulletPoint : A set of 4 low profile, ultra-light aluminum flange lock nuts. These flanged lock nuts are very low profile making them perfect for mini motors that don't have a tall prop adapter. This ensures the nylon inside the nut can actually engage even on short adapters. Use these to customize your air-frame and secure your props.Picture 2 shows the difference between the low profile nut and a regular lock nut.IncludesSet of 4 shallow black anodized aluminum flange lock nuts (CW thread)5mm coarse 0.8 thr BulletPoint1 : Pitch: 0.5mm BulletPoint2 : Hex Width Across Flats: 5mm / 0.2" BulletPoint3 : Height: 3mm / 0.12" BulletPoint4 : Made of Carbon Steel, Zinc Plated Finish, firm and corrosion resistant. BulletPoint5 : APPLICATION: Strong and are great for both indoor and outdoor use. Color : Silver DriveSystem : External Hex ExteriorFinish : Zinc,Carbon Steel ExternallyAssignedProductIdentifier1 : 051907318354 ExternallyAssignedProductIdentifier2 : 0051907318354 ExternallyAssignedProductIdentifier3 : 00781002123019 FinishType : Silver GpsrSafetyAttestation : 1 GradeRating : Grade 5 ItemDisplayWeight : 0.09 ounces ItemName : uxcell M3 X 0.5-Pitch Carbon Steel Female Thread Kep Hex Head Lock Nut 50pcs ItemPackageDimensions_Height : 12.7 centimeters ItemPackageDimensions_Length : 0.254 centimeters ItemPackageDimensions_Width : 9.652 centimeters ItemPackageQuantity : 10 ItemShape : Hexagonal ItemTypeKeyword : hardware-locknuts Manufacturer : uxcell Material : Steel MeasurementSystem : Inch MeasurementSystem1 : Metric MeasurementSystem2 : Inch MetalType : Carbon Steel ModelNumber : a18091400ux0113 NumberOfItems : 10 NumberOfPieces : 1 PartNumber : a18091400ux0113 Pattern : Nylon Insert ProductDescription : Description: Keeps Lock Nuts include a hex nut with a pre-assembled, free-spinning external tooth lock washer. They should be used in low-load assemblies to ensure a lasting, reliable hold for any project. These nuts have an external star washer attached and when tightened, they bite into a elastic surface thus providing a locking action.