Panning Base Lever-Release Clamp PC-58L Model: PC-58L Base diameter: 58mm/2.3in Length: 80mm/3.1in Width: 73mm/2.9in Height: 21mm/0.8in Net weight: 127.8g/4.5oz Mounting thread: UNC3/8”-16 T6061 grade aluminum main body, elaborately CNC machined with hard-anodized finish making it durable and resistant to abrasion and corrosion. Two way to lock, compatible with both Arca and Picatinny/Nato dovetail structure. PC-58L features lever-lock structure which is easy to operate and ensures swift locking of QR plate compared with regular clamp. Arca standard dovetail groove. 360 degrees panning base can be locked at any direction desired Arca mounting socket at the base of the clamp so it works with different tripods heads.