About this item HIGH QUALITY: The fasteners nuts are made from high quality stainless steel, which have high hardness and a long service life. EASY TO USE: These T-slot nuts are simple to use and convenient to connect aluminum profiles to other parts. PRACTICAL: EU20 is used on profiles aluminum with 6mm slot, while EU30 is used on profiles with 8mm slot, can bring you more convenience. EUROPEAN STANDARD: These hammer head nut has a wide range use, mainly used for European standard aluminum extrusion profiles. PACKAGE INCLUDES: There are total 50pcs t-nut that you can use for many projects, very practical, can meet your use.