The unique fitting system, specially designed for the Masamune Razor and one of the exclusive specifications of our razor, is responsible for: High perpendicularity between handle and razor head which permits a better precision during the shaving; Symmetrical load distribution on the threads preventing excessive wear and increasing resistance; Compact and reduced clearance between the parts which provides: -Less vibration on the blade cutting line; -Smoother and safer shave; -Increase of the blade tool life. Protection to mechanical deformation of the threaded pin on the top cap. Designed to endure a lifetime