DescriptionThis item is well made of premium material for durable and practical use. With and precise design, the shaft couplers are widely applied to small CNC machines encoding and printers shaft coupling, and simplifies the debugging difficulty.(wrench is delivered randomly)Features- Color: Silver. - Material: Iron. - Size: 2.10 x 2.10 x 1.10cm/ 0.83 x 0.83 x 0.43 inch. - Rigid flange shaft coupling, accessories for rc model motor, rc airplane boat ,diy model. - Fine plating iron, hardened by heat treatment, and then electroplated.- Durable and insulation, make your shaft more stable, easy to install and replace. - A special coupler, which can fix one shaft to a plane and install other parts on the shaft easily. - Suitable for model shaft connection, perfect accessories for RC model motor, etc.