Features: Double Functionality Planumberebog: Features a 17mm sphere head and 1/4 external screw, consistent tubes of 17mm 55mm diameter and backs exteriors up to 50mm thick. Comprehensive Rotatparticlemail: Hard wearing a 17mm sphere head for full rotation, excellent for attaching phone clamps, panel possessors, and light addons. Effortless Installatparticlemail: Developed for easy arrange, simply link directly to tripods for quick and secure appendage. Modifiable Corner Connectparticlemail: Includes a 1/4 external screw for flexible corner adjustments, ideal for mounting action cameras and DSLRs. Flexible Clamping Applicatparticlemail: Twelve hundred use with live broadcasting phone stands, desks, velocipedes, additionally, supporting tubes from 17mm to 55mm diameter. Specifications: Substancemail: Polystyrene Sizemail: Total length 13cm Eight hundred backs round tubes with diameters of 17mm 55mm otherwise countertops with thicknesses within 50mm Package Includes: 1 17mm ball head clip base 1x17mm cue ball head 1/4 external screw note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.