Description:   50pcs M4 T Sliding Nut Block for 2020 Aluminum Profile Zinc Coated Plate Aluminum Accessories       Specification:   Material: Carbon steel    Surface Treated: Zin plated   Type: T Sliding nut   Series: 20 Series   Quantity: 50pcs    Used for:  Insert into aluminium profile and connected together with T screw or others.   More Details: