iShoot IS-SM1550 Tripod Mount Ring for Sigma AF APO 50-500mm F4.5-6.3 DG OS HSM

Product model: IS-SM1550 iShoot IS-SM1550 Tripod Mount Ring for Sigma AF APO 50-500/4.5-6.3DG OS HSM etc features a RRS/Arca-Swiss fit quick replease interface. Features: Made of Aviation Aluminum, CNC precisely machined, surface anodic oxidation, with stainless steel screw, lightweight design of hollow, weighs about 195g; Referring to and modified from Sigma original TS-31 standard design, bearing is enhanced, details are improved, and added the features of finger position and quick release plate, more practical; Tripod ring diameter is about 85.5mm, the use of embedded PP material to increase the damping; accurate bayonet, same to the original one, easy to quickly disassemble and adjust the body composition; Tripod ring comes with quick-release plate structure, with 1/4" and 3/8" screw holes; Quick release plate is AS standard, compatible with RRS / ARCA-SWISS / KIRK / WIMBERLEY / MARKINS / SUNWAYFOTO / KANGRINPOCHE / BENRO / SIRUI / MARSACE / ISHOOT ball head of Arca 39mm fit, sui