Pictured here is one of the custom stainless steel standoffs we supply our drone manufacturing customer. Production is done in the USA in 18-8 stainless steel material, with passivation as the final step in the production process. Lead times vary depending on the quantity required and rush options are typically available upon request. M3 coarse female thread is incorporated on both ends and the width across the flats is an odd 4.15MM on this standoff.