Applicable models - Compatible with chainsaws 340, 345, and 345e. This ensures the accessory matches device requirements and is easily interchangeable. What’s included - 1 piston - 1 piston pin - 1 piston ring - 2 circlips - Provides a complete kit to cover typical replacement needs. Size details - Piston outer diameters: 40 mm and 42 mm - Suitable for different cylinder sizes and designed for firm installation Part compatibility - Replaces the corresponding accessory with part number 503907371, simplifying the search for replacement parts and maintenance Product type and purpose - For two-stroke chainsaw engines, specifically designed for garden tools to ensure stable operation Use scenarios - Scenario 1: Rebuild the top end on compatible models (340/345/345e) to restore compression and power - Scenario 2: Replace worn or seized piston components to prevent further engine damage and maintain performance - Scenario 3: Use as part of routine maintenance for two-stroke chainsaws used in backyard or professional garden work to ensure reliable startup and operation