This replacement piston ring is made of high-density cast iron with excellent heat-conducting properties, designed to work at high temperatures and under heavy mechanical loads. As a reliable alternative to the original part, it successfully maintains maximum compression, prevents combustion gases from passing into the crankcase and ensures proper heat transfer from the piston to the cylinder walls. The high-quality finish and precise geometry reduce surface friction, which is key to stable power and long service life of these demanding professional saws. Ring diameter: 54 mm Ring thickness: 1.5 mm Manufacturer: high-compatibility aftermarket part Reference OEM number: 1115 034 3012 Compatible models: STIHL 045 AVSE, 045 AVSEQ STIHL 056 S Before fitting a new ring, thoroughly clean the groove on the piston of burnt two-stroke oil residue, soot and carbon deposits so that the ring has free movement and can seal properly. The ring material is brittle, so fit it carefully and without excessive spreading so that it does not break when passing over the piston crown. Before inserting the piston into the cylinder, lightly oil the inside of the cylinder and the ring itself with clean two-stroke oil for a safe first start. Stock and availability of parts can be checked by sending an inquiry or by calling our phone number.