Lee has developed one of the best split-lock ring ever made. This 4 pack of aluminum lock-rings are compatible with 7/8x14 threaded Lee reloading dies and Lee reloading presses. They feature a torque type splined exterior for a no-slip grip. An O-ring, for anti-rotation, is included to ensure the ring never loosens during use. FeaturesCompatible with 7/8 x 14 threaded Lee reloading dies and Lee reloading presses.Torque type splined exterior, for a no-slip grip."O" ring, anti-rotation, included. Never loosens during use.