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Amazon.com: Tanstic 30Pcs M4 Neoprene Well Nut with M4 x 20mm Stainless Steel Pozi Screws Assortment Kit for Windscreens, Trucks, and Motorcycles : Industrial & Scientific
Diall M4 Pozidriv Countersunk Zinc-plated Carbon steel Machine screw & nut (Dia)4mm (L)20mm, Pack of 20 | DIY at B&Q
Amazon.com: M4-0.7 x 10mm,12mm,16mm,20mm,25mm,30mm Pan Head Phillips Machine Screws,18-8 Stainless Steel Bolts Nuts Washers Screws Assortment Set (M4 Pan Head Phillips Screws) : Industrial & Scientific