Help players master the correct feeling on swinging ball. The rod sleeve is pushed from the rod head to the grip direction. The laser is pushed from the lower part aim at the mouth of the bayonet and pushes up. After the installation is successful, adjust the laser sight left and right until the laser line is 90 degree perpendicular to the rod head.Then you can use it with confidence. Fits easily to any golf club.Small size and easy to carry. Placing this plastic golf putter on your golf club, you don't feel so much weight on your golf club as it is so lightweight.