■材质：锌合金主体、钢铁挡片■Material： Body-Zinc alloy、Cam-Steel ■表面处理：黑色电著主体,镀锌挡片■S.Tr：Black coated,Cam-zinc plated ■Easy grip adjustment ■Reduce or eliminate noise and rattles cause by vibratio ■The cam could compression 7m/m,to improve strength and tightly close for use
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