Hobbypower 3k Cf Motor Mount Set for 25mm Arm Tube Quadcopter Hexacopter Multirotor 1pcs 3K CF motor mount plate with 2pairs 25mm Arm/tube Clamp Motor mount plate: Made of 3K carbon fiber , Thickness: 1.5mm , Weight: 4.5g, Apply to 16mm/22mm/25mm arm/tube clamp Arm/tube clamp: Made of aluminum, Dimension: approx. 37 x 31 x 5 mm , Hole spacing: 31mm, Weight: 7.7g