Specification Brand : Zadery BulletPoint1 : Made of high-quality steel with zinc plated finishing, last for long-term use BulletPoint2 : Steel roll in t nuts are compatible with a wide range of T-slot accessories, suitable for various applications, including CNC machine,CNC laser cutters,building industrial aluminum frame structures,Robotics Projects and more BulletPoint3 : Sliding t nut design allows for easy and quick installation into T-slot hardware, save time and effort BulletPoint4 : The smooth surface of the steel roll allows for seamless movement within the T-slot, enhancing overall functionality BulletPoint5 : Size: Thread size:1/4"-20, only suitable for 1010 series aluminum extrusion profile, please check the size before purchasing Color : zinc blue DriveSystem : Slotted ExteriorFinish : 锌 GradeRating : commercial ItemName : Zadery 1/4"-20 Roll in T-Nut with Ball Spring, Slide in Economy Steel T-Nut for T Slot Track, Applicable for 10 Series or 1.0'' Base Aluminum Extrusion, 20 Pieces ItemPackageDimensions_Height : 14.5034 centimeters ItemPackageDimensions_Length : 1.0922 centimeters ItemPackageDimensions_Width : 11.7094 centimeters ItemTypeKeyword : t-nuts Manufacturer : Zadery Material : 碳钢 MetalType : Carbon Steel ModelNumber : Z-1/4 dz-20pcs NumberOfItems : 20 NumberOfPieces : 20 PartNumber : Z-1/4 dz-20pcs ProductDescription : 1.T-nut with ball spring works with 1/4"-20 bolts (Not included) to attach joining plates, corner brackets, hinges, and other t track accessories to any 1.0" based aluminum extrusions. 2.Item package:20 pieces 1/4"-20 t-nut with ball spring.