IS-19BK-05 Carbon Steel Spring loaded ball transfers enables self-adjustment Ball Transfer IGUCHI - JapanSpring loaded ball transfers enable self adjustment for even load distribution. Applications include shearing machines, presses, and molding machines, die setting, tool bases, press brakes, and shock loading applications. Spring durability over one million times. (Spring can be replaced)IS BK spring loaded ball transfers are used for press machine die setting and die removal. With the built in spring, convey, position, and clamp the die on the press