Check the listing for details. Tripod Head Mount Converter Arca Fit Quick Release Plate Adapter for Ballhead. Condition: New. Listed at 16.60 USD. iShoot Tripod Head Mount Converter Quick Release Adapter IS-STH58 for Cantilever Head, Fluid Head, Ball Head and Other Tripod Heads with Circular Bottom and 3/8 Screw Hole Bottom is ARCA Fit Quick Release Plate Feature Compatible with Tripod Ball Head of ARCA-SWISS / RRS Fit Features: 1. The tripod head mount converter is made of high-density Aviation Aluminum, lightweight and solid; precisely machined by world-class high-end CNC turning center; hollowed-out work processed by Multi-Diamond Cutter finely; 2. The quick release adapter surface using vibration polishing technology and multiple anodic oxidation, greatly increased the color uniformity of the metal surface; the appearance and exquisite workmanship is much better than similar products made by mold; 3. The converter adopts a double-layer structure with a maximum diameter of about 58mm and a thickness of about 10mm, the net weight is about 55g; 4. The front side is circular with anti-skid rubber embedded, equipped with stainless steel anti-skid screws, can be installed to the bottom of tripod head via 3/8 Stainless steel screw; the reverse side adopts the ARCA-SWISS / RRS standard quick-release plate structure, suitable for 39mm Arca-Swiss fit ball head and clamp; 5. The tripod head mount converter is suitable for cantilever head, fluid head, ball head, and other tripod heads with circular bottom and 3/8 screw hole, to reach quick release and quick conversion functions; 6. This bottom Quick Release Plate feature of 39mm Arca-Swiss fit, compatible with RRS / ARCA-SWISS / PMG / WIMBERLEY / MARKINS / PHOTOCLAM / SUNWAYFOTO / BENRO / SIRUI / MARSACE / ISHOOT ball head of Arca 39mm fit, suitable for iShoot IS-JZ30 / IS-JZ50 / IS-JZ64 / IS-QJ58 / IS-QJ64-FD / IS-JZ60BK / IS-JZ70MFT / IS-JZ80BK. Applicable to: Cantilever head, fluid head, ball head, and other tripod heads with circular bottom and 3/8 screw hole; Bottom quick release plate suitable for 39mm Arca-Swiss fit ball head and clamp; to reach quick release and quick conversion functions Package Including: 1 x iShoot Tripod Head Mount Converter Quick Release Adapter IS-STH58 (The other items in the photos not listed here are for illustrating only, not included)