This engine stand adaptor is made specifically for the 3-rotor 20B rotary engine. It mounts to the large center housing and has welded-in through-spacers for security. Adaptor is designed for the Harbor Freight 1000lb engine stand, but should work with most other common engine stands. Price includes fasteners to bolt adaptor to stand and engine to adaptor. Ships in USPS Priority Mail Flat Rate Box, within the USA.