APPLICATION: RC Airplane Motor Base set are perfect for XK X450 RC helicopter. MATERIAL: RC Airplane Motor Mount is made of high quality material, wear resistant, strong and durable. FINE WORKMANSHIP: Exquisite craftsmanship, precision manufacturing, easy to install. REPLACEMENT PARTS: Good replacements to modify and upgrade your RC Airplane. PACKAGE INCLUDED: 1pc RC Airplane Upper Left Motor Seat Bracket, 1pc RC Airplane Upper Right Motor Seat Bracket, 1pc RC Airplane Lower Left Motor Seat Bracket, 1pc RC Airplane Lower Right Motor Seat Bracket, 1pc RC Airplane Left Motor Base, 1pc RC Airplane Right Motor Base, 1pc RC Airplane Rocker L, 1pc RC Airplane Rocker Right, 2pcs RC Servos Fixtures. Size Chart: Upper Motor Mount Bracket: LengthxWidthxThickness: 15.3cmx3cmx3cm/6.02inchx1.18inchx1.18inch Lower Motor Mount Bracket: LengthxWidthxThickness: 15.3cmx3cmx1cm/6.02inchx1.18inchx0.39inch Package Includes: 1 RC Airplane Upper Left Motor Seat Mount 1 RC Airplane Upper Right Motor Seat Mount 1 RC Airplane Lower Left Motor Seat Mount 1 RC Airplane Lower Right Motor Seat Mount 1 RC Airplane Left Motor Base 1 RC Airplane Right Motor Base 1 RC Airplane Rocker L 1 RC Airplane Rocker Right 2 RC Servos Fixtures Note: Please allow slightly errors due to manual measurement and different monitors.