1、This is a 150mm macro focus rail slider with quick release plate. 2、Aviation aluminum main body, CNC precision machining, surface anodic oxidation treatment. 3、Equipped with stainless steel zoom rod, stainless steel clutch, intermeshing helical powertrain, which can move back and forth within precise mm distance for fine-tuning the focus for macro photography, the maximum tested horizontal load weight is about 3.4 kg. 4、The clamp width on the slider is about 73mm and has a level, which conforms to Arca-Swiss / RRS standard. The slider length is about 150mm, and the bottom is designed with Arca-Swiss / RRS standard quick release plate structure. 5、Compatible for Arca-Swiss / RRS / KIRK / WIMBERLEY / MARKINS / SUNWAYFOTO / KANGRINPOCHE / BENRO/SIRUI / MARSACE quick release plate and ballhead of Arca-Swiss / RRS standard fit. Suitable for IS-JZ30 / IS-JZ50 / IS-JZ64 / IS-QJ58 / IS-QJ64 / IS-JZ60BK / IS-JZ70BK / IS-JZ80BK. Condition: 100% Brand New Item Type: Macro Focusing Rail Material: aluminum alloy Color: as picture shown Size: approx. 203x106x34mm/8x4.2x1.3inch (L*W*H) (including rotary knob) Slider length: approx. 150mm/5.9inch Adjustment range: approx. 118mm/4.6inch Maximum load: about 3.4kg 1 x Macro Focusing Rail 1 x Manual