Specification Brand : Tanstic BulletPoint1 : Package Includes: In this set, you will receive 48pcs roll in T-nut for 4 sizes, including 12pcs M4, 12pcs M5, 12pcs M6, 12pcs M8. Sufficient quantity and sizes can meet your usage need. BulletPoint2 : Sturdy and Durable: Roll in T-nut is made of carbon steel, with high hardness, wear resistance, durability, nickel plating on the surface, good rust resistance, good performance, and long service life. BulletPoint3 : Easy to Installation: The spring ball on the roll in T-nut can fix the nut in place and prevent it from sliding when screwed in, making installation quick and simple. BulletPoint4 : Good Performance: Including four sizes of roll in T-nuts, M4, M5, M6, and M8 from the 4040 series, they are very suitable for T-shaped groove extrusions and can be well fixed on the track. BulletPoint5 : Wide Application: Suitable for 3D printers, CNC laser cutting machines, machine protection devices, robot projects, building industrial aluminum frame structures, CNC routers, workstations, etc. Color : Silver GpsrSafetyAttestation : 1 IncludedComponents : Roll in T-Nut with Ball Spring ItemName : Tanstic 48Pcs Roll in T-Nut T-Nut with Ball Spring Roll Ball Elastic Nuts for 4040 Series Aluminum Extrusion Profile Rail ItemPackageDimensions_Height : 2 inches ItemPackageDimensions_Length : 7 inches ItemPackageDimensions_Width : 5 inches ItemPackageQuantity : 16 ItemTypeKeyword : t-nuts Manufacturer : Tanstic Material : Carbon Steel ModelName : Roll in T-Nut with Ball Spring ModelNumber : T1834-1836 NumberOfBoxes : 1 NumberOfItems : 48 PartNumber : T1834-1836 ProductDescription : Tanstic 48Pcs Roll in T-Nut T-Nut with Ball Spring Roll Ball Elastic Nuts for 4040 Series Aluminum Extrusion Profile Rail