Five thread size: M10 x 1.0mm, M12 x 1.25mm, M14 x 1.25mm, M16 x 1.5mm, M18 x 1.5mm. 5x brass adapters M10, M12, M14, M16, M18. Motors drive the engine to rotate at 100-150R/MIN speeds for 3-5 seconds.
eBay