STIHL MS 400 C M Gas Powered Chainsaw Quickstop M Tronic Guide Bar Length:18 Inch This lighting kit is built This lighting kit is built in durable cast aluminum alloy housing with stainless steel mounting hardware and wiring harness and lighted rocker switch while the helmet system’s six point ratchet suspension is easily adjustable for a comfortable STIHL M Tronic™This product features M Tronic™ (M) a new generation of Intelligent Engine Management that eliminates the low and high speed carburetor adjustment screws The decompression valve temporarily reduces the compression in the combustion chamber during cranking and helps reduce the effort needed to pull the starter rope