1. Main body made of Aviation Aluminum, CNC precisely machined, surface anodized, the maximum size with knob is about 170mm long, net weight is about 380g2. With stainless steel gear spiral zoom lever, stainless steel clutch, intermeshing helical power transmission, can move back and forth in precise mm distance for -adjustment focusing, convenient for close-up photography of -object, the tested maximum horizontal load weight is about 4kg3. Compatible with for Arca-Swiss/for /for KIRK/for /for MARKINS/for /for KANGRINPOCHE/for /for /for MARSACE quick release plate and ballhead of Arca-Swiss/ standard fit; suitable for IS-JZ30/IS-JZ50/IS-JZ64/IS-QJ58/IS-QJ64/IS-JZ60BK/IS-JZ70BK/IS-JZ80BK.Net weight:about 380gSlide length:about 170mmRegulating range:about 125mmLap length:about 1mmMaximum load:about 4kgColour:BlackMaterial:MetalSize:Outline size:about 200mm long, 50mm wide, and 35mm high (including knob)Package Contents:1 * Macro Focusing Rail Slider