SmallRig Counterweight for DJI Osmo Mobile 3/4 Smartphone Gimbal (20gx3) 3060 is designed to balance your smartphone by adding counterweights to the gimbal, especially when using an external wide-angle lens or a case which makes your phone heavier. The counterweights screw into the DJI OM4 gimbal with an M3 screw and features an M3 thread on the bottom which can be stacked up based on your needs. The surface features lines to increase friction for easy installation and detachment.