These bolts have been manufactured with a female hexagon dome head, they are tightened by the use of a 6mm allen key.
Length from top of dome to end of thread: 27mm
Length from nut head to end of thread: 19mm
Length of threaded section: 10mm
Used to connect the clutch hydraulic hose to the clutch slave cylinder and allow easy bleeding of air from the system.
Scorpa / Sherco part number R068