NEF Assortment Kit, Round Head and Nut, Coarse USS and Fine SAE Thread, Set of 1900 Pieces. 5.0 out of 5 stars 2. $120.28 $ 120. 28 $6.33/100 Items $18.64 shipping. Only 3 left in stock - order soon. HVAZI M2 M2.5 M3 M4 M5 M6 Stainless Steel Phillips Flat Head Screws Assortment Kit.