The innovative P31 features twelve 1/4" screw holes, certificated by multiple innovation and design patents. No matter it is used with the cages of professional cameras, digital SLR cameras or mobile phones, the patent design is capable of adapting to any cages with 1/4" screw holes, making the installation of the cage extension effortless. Additionally, the product is attached with functional screw kits, allowing that its multi-directional installation is compatible with various usage scenarios.