JRL AIR FILTER COVER LATCH KNOB TWIST LOCK Fit For STIHL MS210 MS230 MS250 MS290 MS310 390 Fit: STIHL MS210 MS230 MS250 MS290 MS310 MS390 Chainsaw Package Includes: 2pcs Size: As Picture Weight: About 70g Replace OEM# 1123 141 2301 Note: Please check your unit to ensure the compatibility before submitting the order. Actual pictures on the listing are ready for your reference.