Lee ultimate spline drive lock rings. 4 pack of red, white, blue, and gold anodized aluminum lock-rings with O-rings. One of the best split-lock ring ever made. Dies are simply easier to install with the lock ring wrench. Compatible 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.