[M4 |  4mm inner diameter]

[M6 |  6mm inner diameter]

[M8 |  8mm inner diameter]

M4 Dome Nuts Brass, also known as Cap Nut/Crown Hex Nut/Blind Nut/Cap Nut. DIN1587 Used for multiple applications to ensure a protective and aesthetic finish. Specifications DIN1587 Brass Sizes Available: M3, 3mm ID, Height 5.8mm, Hex Side 5.3mm, M4, 4mm Inside Diameter, Height 7.8mm, Hex Side 6.8mm, M5, 5mm Inside Diameter, Height 9.7mm, Hex Side 7.8mm, M6, 6mm Inside Diameter, Height 11.5mm, Hex Side 9.8mm, M8 Inner diameter of the inner diameter of M8 mm inner diameter; height: 14.9 cm, hexagonal side 12.7 mm. Note: Please allow 0.2-1 mm measurement deviation. Dimensions are subject to manufacturer and specification tolerance. Note: Looking for brass discs (M3 - M10) try this link https://www.amazon.co.uk/dp/B087JCGG1W?ref=myi_title_dp (for orders up to 4pm) Royal Mail 2nd Class in the UK usually ships within 2 to 3 business days but may take up to 10 business days from the shipping date. (International standard delivery takes 5 to 7 business days, but may take up to 21 days). Note: If a multiple purchase from FixitFlo is placed, mainly 1. class services. If delivery details were provided incorrectly, a refund or replacement will be considered invalid provided the correct information is changed and confirmed prior to shipment (by FixitFlo) In some circumstances, for refunds/returns, shipping costs will be supported by the buyer. Thank you for your understanding.