JJRC H39 RC Selfie Drone ,Kingtoys WIFI FPV Foldable Drone, 720P HD Camera Live Video,2.4GHz 4CH 6-Axis Gyro APP Control FPV Helicopters ,Altitude Hold, Gravity Sensor and Headless Material:ABS Plastic&Steel plate. Dimension: hole center distance 26mm; Shaft diameter 6mm; shaft length 22mm; 2 pieces Tuning Keys Pegs(one is for left,the other one is for right). Suitable for all ukulele size under 23 inch package include:2*ukulel peg, 4*grain screws, 4*grains washers