Motor mount for your medium sized quad, hex or octo-copter. The screw holes matches 28mm sized motors, like the NTM Prop Drive Series 28 from HK: http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=39314 Attach the mount to a 10mm wooden boom and take to the skies! New and improved! You can now open this thing in customizer and set the shape of the boom (square or circular) and its diameter.