[FEATURE] Screws with cross head and hex nut. [SIZE] M4 Thread Diameter and 38mm Length. [APPLICATION] The screws set is perfectly works for any CPU Cooling Block HeatSink Cooler. [MATERIAL] Made of stainless steel, which features is strength and offers good corrosion resistance in bad environment. [PACKAGE CONTENT] All of Bolts and Nuts pack in one bag.