Features: Designed with triple 1/4-inch screw threads, available for upside down dual end use and articulating arm expansion. The dual ends can be both extended, the total clamping phone width is about 6.2-9.3cm/2.44-3.66in. Avaition aluminum alloy constructed, high grade CNC precise machinery and anodized surface, smooth to touch. The bottom Arca-Swiss quick release interface can meet the needs of quick mounting on ball head or tripod, more efficient. Widely suitable for phone video making on tripod with cold shoe mount for microphone and LED light compatibility.