[Features]▪ Prevents deformation of the area around the bolt head (the cupping phenomenon) thanks to a large seating area▪ Integrated seating surface on the bolt head to avoid fatigue issues like those with spring washers, etc.▪ Stable tightening torque and axial force with the smooth seating surface▪ Smoother fixing, as the increased seating area permits larger holes to be drilled▪ Reduces component count as washers are not required