A collection of different size legs/skids for the BOLT250 frame. They should also work on most 250 sized fpv quads particularly the ZMR250. Please see instructions for more information. Update: 3mm holes were not consistent, changed all to 3.25mm to ensure ease of fit. Made to use 12mm machine screws with nylon lock nuts. The nutless set does not use a nut, instead has a narrow screw hole to self tap. As the arms are swept by 20 degrees, there is a A set and B set for front and back arms. A variety of arm lengths are available, 12mm, 15mm, 20mm, 25mm. 12mm is a good size where you don't mount the battery on the bottom. The 25mm provides good battery clearance for battery mount on the bottom..