3/8inch screw hole: designing with 3/8inch screw holes and Alai positioning holes, can use to expand other devices and expansion needs. 1/4inch screw: with 1/4inch screw, strong compatibility and can be installed on camera racks or other devices with 1/4inch screw holes. Small and exquisited: exquisited workmanship, beautiful appearance, small in size and lightweight, easy to store and carry. Nonslip pad and locating pin: equipped with nonslip pad and locating pin to scratches and accidental sliding, allows quickly disassembled and assembled through the knob. Aluminum alloy: aluminum alloy, hollow designing, providing you with excellent user