These quick release clamp by Sirui I already knew of the already purchased Sirui K-10X and K-30x femoral heads and did so again solo again bought two old respectively to a 30 year still spry and technically excellent tripod Velbon or a SteadePod rope tripod upgrade arcaswiss-compatible on the present state. My fellow reviewers have quite correctly estimated that this quick-change base with their 3 dragonflies, the rubberized locking clamp, solid reliable processing and handling inferior other products from "reputable" manufacturers in nothing and is recommended. I wonder only that Sirui total is still little known and Paul Ehrlich Institute hardly ever at least to my knowledge when it comes to a "winner" or "very good" judgment to give. But why?