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Office & Factory in Taiwan ROC. The Back Adjustments feature brings the backrest closer to provide personalized support and comfort. Manual Lumbar Support Mechanisms able to apply on 1. wooden backrest & seat( office chairs) 2. metal frame backrest (gaming chair & vehicle seat & furniture: sofa). 【Product Styles】 2 WAY Mechanisms (manual): controls In & Out movements 【Supporting Panel】 Material made of special nylon, supportive with two size. 1. H Panel dimension: 262 X 242 mm (lumbar moving range:28mm) 2. S Panel dimension: 160 X 150 mm (lumbar moving range:25mm) 【Adjuster/Actuator】 1. 601 (Biggest, with metal frame): under the seat—with turning sound. 2. 602(Thinnest, smallest): on the backrest—without turning sound. 3. 605(Mid Size): on the backrest —without turning sound. 【Knob Options】 1. 4 different types 2. With or without turning sound options 【Adjuster/Actuator Assembly】 1. 601- under the seat 2. 602 & 605- on the backrest 4 WAY Mechanisms (manual): controls In & Out; Up & Down, 4 directions. (patented mechanisms) 【Supporting Panel】 1. S Panel dimension: 160 X 150 mm (lumbar moving range: In & Out:25mm; Up & Down:70mm) 【Adjuster/Actuator】 1. 2-IN-1: Patented mechanism, controls 4 directions by one dual-use knob. 2. 4WAY: two knobs, one controls In & Out, the other controls Up & Down. 【Knob Options】 1. 2 types 2. All without turning sound. 【Adjuster/Actuator Assembly】 1. Both able to fix under the seat or On the backrest.