Specification Brand : uxcell BulletPoint1 : Made from carbon steel,have high hardness, surface is Nickel plated or Zinc plated for good rust resistance. BulletPoint2 : Used for T-slot aluminum profile 40mmx40mm. BulletPoint3 : Easy to be roll into T slot of aluminum profile. BulletPoint4 : Package content: 15 pcs x T-Nuts BulletPoint5 : 4040 Series Aluminum Profile T-Nuts widely used for building industrial aluminum frame structures, 3D printers, CNC Routers, CNC laser cutters, Robotics Projects DriveSystem1 : Slotted DriveSystem2 : External Hex ExteriorFinish : Aluminum,Nickel Plated,Zinc,Carbon Steel FinishType : Nickel GpsrSafetyAttestation : 1 GradeRating : commercial ItemName : uxcell Half Round Roll-in Nut, M8 Threaded for 4040 Series Aluminum Extrusions Profile, Pack of 15 ItemPackageDimensions_Height : 9.1 centimeters ItemPackageDimensions_Length : 1.5 centimeters ItemPackageDimensions_Width : 6.1 centimeters ItemShape : Round ItemTypeKeyword : t-nuts Manufacturer : uxcell Material : Carbon Steel MeasurementSystem1 : Metric MeasurementSystem2 : Inch MetalType1 : Aluminum MetalType2 : Nickel MetalType3 : Carbon Steel ModelNumber : a18103100ux0459 NumberOfPieces : 15 PartNumber : a18103100ux0459 ProductDescription : 1.Made of carbon steel, Nickel plated or Zinc plated Finished. 2.T-Nut with M8 thread. 3.Suitable for standard 40mmx40mm aluminum profile extrusion slot. 4.Easy to be roll into T slot of aluminum profile. 5.Could be used together with T screw/hex screw