★ Multi-purpose rail nodal slide with AS standard screw-knob clamp, precise laser engraved, Scale and spirit level, excellent for panoramic and macro photography. Clamp with captive knob stops at maximum opening. ★ High quality aluminum alloy is used to ensure a light weight but super high strength support. All metal construction.double dovetail clamp plate(Upper and lower layer), can be The left Rotated 90° and The right Rotated 90°. ★ 39 mm wide double dovetail clamp plate,Universal Quick Release System has been designed to be compatible with other brand quick release systems. Suitable for most ball heads. ★ dovetail clamp plate with expandable 1/4 screw holes- 5pcs,You can install other equipment ★ Compatible with AS standard plate such as: RRS, ARCA--SWISS / KIRK / Wimber ley / MARKINS / SUNWAYFOTO / Kangrinpoche / BENRO / SIRUI etc. Compatible with ballhead tripod or monopod of Gitzo, Manfrotto, RRS, Arca-Swiss