Just rounded off the alloy Allen bolt hex head on my bolt up Hope Seatclamp. Managed to get the clamp off in tact with the threaded loose insert. Wanted to just replace the bolt with a steel one but not sure of the size. Bigger than 5mm but a bigger loose Allen bolt I have lying around is the right diameter but looks like its a different thread pitch so am a bit worried it might be a weird size or even imperial.
Anyone know what size it might be?

All sorted, Hope sending one out FOC – brilliant service:)