ITEM NAME:3X(340Pcs Internal Tooth Starlock Washers Quick Speed Locking Washers Push Z9R1) ☆★ Product Details ★☆ 3X(340Pcs Internal Tooth Starlock Washers Quick Speed Locking Washers Push Z9R1) 3X(DIY Supplies:Metalworking model:M3 M4 M5 M6 M8 M10 M12 used in machinery equipment,industria High Quality Internal Tooth Starlock Washers Kit Anti-corrosion and Durable A Lock washer exerts a spring force between the fasteners head and the substrate,which maintains the washer hard against the substrate and the bolt thread hard against the nut or substrate thread,creating more friction and resistance to rotation. colour:black Material:metal Size:17.5*10*2.2cm Package Contents: 60*M3M4 manganese steel internal tooth washer 60*M4 manganese steel internal tooth washer 60*M5 manganese steel internal tooth washer 50*M6 manganese steel internal tooth washer 50*M8 manganese steel internal tooth washer 40*M10 manganese steel internal tooth washer 20*M12 manganese steel internal tooth washer)