Nuts Hexagon Nut: Size M1.6~M10. #0~3/8 Square Nut: Size M2.5~M8 Hexagon Flange Nut: Size M3~M10. #6~3/8 Nylon Insert Lock Nut: Size M2~M10. #2~3/8 Domed Cap Nut: Size M3~M12 K Nut: Size M3~M8. #4~3/8