Manufactured by Protex in the UK to military specifications (NSN 5820-99-253-6123), these are a stainless steel powder coated black industry standard 89-1069 catchbolt

Dimensions are shown in the photo above, if you are not familiar with the Protex Catchbolt which is the industry standard case fastener of choice, we suggest you check out the Protex website,

 Priced and supplied each x1