Rotorama Prop Tool is a handy wrench for field servicing your drone. The prop wrench has a smooth-running bearing that rotates only in one direction. One side is used for tightening propellers, the other for loosening. On the sides of the wrench there is a 1.5mm and 2mm hex, which comes in handy for any quadcopter repairs. The end sockets for the nuts are replaceable. The wrench has a laser-engraved Rotorama inscription and logo.