Brass knob compatible with SOTO ST-310 Easy to install by simply removing the ST-310 tool plug knob and securing the included screws using a hex screwdriver. Replacement makes it easier to turn and easier to use. Also, the surface has knurled finish (anti-slip) for excellent maneuverability. The ST-310 is also portable, and can be folded without compromising its portability. Cannot be attached to ST-330. *This product is only the knob and does not include the ST-310. Please check if the screws are not loose. We do not offer any **regarding accidents encountered in use of this product or damage to the targeted product. When using this product, burner sellers may not be covered under warranty. This product is made of brass, so there may be rust (patine) due to deterioration over time.