Rebuilding a small engine on a brush cutter or trimmer? This cylinder piston ring gasket set covers two common bore sizes: 40mm and 44mm. It’s compatible with 43CC and 52CC engines found on many popular models, including those labeled 1E44F-5, 44F-5, BG520, CG520, CG430, 1E40F-5, and similar. The kit includes pretty much everything you need for a top-end refresh: a cylinder, piston, rings, wrist pin, circlips, gasket set, and even a bearing. Perfect for bringing a tired, low-compression engine back to life or fixing damage from a seized piston. Before buying, carefully compare the photos and specs to your old parts to make sure they match. After you get it, if anything seems off, just reach out – the seller is ready to help. A great value set for DIY repairs on garden power tools. Get that trimmer cutting like new again!