These 40mm two-part eyelets are manufactured from 0.5mm of steel making them a more economical than the brass. Available in 11 popular metallic shades these 40mm eyelets can be used on a maximum pole diameter of 30mm and they can be fitted quickly and professionally using an eyelet press and 40mm tools. NOTE: however steel eyelets are only suitable for dry cleaning. If you need rustproof eyelets that are suitable for FR treaded curtains please use our brass eyelets. Eyelet liners are available on all our 40mm metal eyelets, simply pop them inside your eyelets for a professional finish and silent glide.