Features 1.Aluminum Alloy Forging Body: Aluminum alloy forging body, lightweight, high strength, surface coating and rust prevention treatment. 2.Electroplated Chromium Processing: The guide chain plate is forged by carbon steel, electroplated chromium processing, high rigidity, wear resistant, rust resistant, and durable. 3.High Compatibility: H, L high and low adjusting screw, high compatibility, bidirectional pull wire arm (support pull up and pull down wire), accurate and direct power transfer, sensitive and fast speed change, accurate adjustment of the positioning screw, the transmission will be adjusted to the best working state. H, L is the positioning screw, the two screws are adjusted to ensure that the chain is between the largest and smallest pieces of the flywheel. 4.Easier and Faster Riding: The variable speed line pulls the guide chain plate and moves the chain to make the chain run on different tooth plates of crankset, so as to achieve different speed transmission tooth ratios, so that riding is more effort saving and faster. 5.Strong Universality: Distribution of 30.8mm / 1.2in and 31.8mm / 1.3in conversion clip ring, support 30.8mm / 1.2in, 31.8mm / 1.3in, 34.9mm / 1.4in pipe diameter, general mountain bikes can be universal, according to the actual situation of the vehicle to use. Specification Item Type: Mountain Bike Front Derailleur Weight: Approx.151g / 5.3oz Material: Aluminum Alloy Body + Carbon Steel Chain Guide Sheet Application Speed: 3x6/7/8S Installation Caliber: Approx.30.8mm / 1.2in, Approx.31.8mm / 1.3in, Approx.34.9mm / 1.4in Applicable Crankset: 42-34-24 Tooth Three Piece Type Crankset Applicable Model: Mountain Bike And Folding Bike Installation Mode: Conventional Clamp Ring Installation (Distribution Conversion Clamp Ring) Package List 1 x Front Dial Transmission 1 x Conversion Clamp Ring