1. Main body made of Aviation Aluminum, CNC precisely machined, surface anodized, the maximum size with knob is about 203mm long, 106mm wide, and 34mm high, net weight is about 420g 2. With stainless steel gear spiral zoom lever, stainless steel clutch, intermeshing helical power transmission, can move back and forth in precise mm distance for micro-adjustment focusing, convenient for close-up photography of micro-type object, the tested maximum horizontal load weight is about 3.4kg 3. The width of the clamp on the slider is about 73mm, with spirit level, for Arca-Swiss / RRS standard fit; the slider is about 150mm long, bottom is designed with quick release plate structure of for Arca-Swiss / RRS standard fit 4. Compatible with 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. Outline size:about 203mm long, 106mm wide, and 34mm high (including knob) Net weight:about 420g Slide length:about 150mm Regulating range:about 118mm Lap length:about 1mm Maximum load:about 3.4kg 1. When using, if it has been screwed to the end, please do not screw it any more, to prevent the clamp off the slider from causing damage, should turn back two circles for next use. 2. The clutch is only used in the fast adjustment; please pay attention to the gear meshing when using, daily use to keep the gear clean, prevent premature wear. 3. When only using one slider, recommend using it with ballhead; when using two in combination, not limited by it, but using with ballhead would be more convenient. (Note: The slider need be used with quick release plate which is not included in the listing, and the other items in