Motorcycle riders, if you can't see your brake fluid level anymore because the sight glass is foggy or cracked, here's your fix. This universal replacement sight glass fits a 12mm hole and works for both front and rear brake or clutch master cylinders – especially common on Suzuki bikes, but it'll fit plenty of other makes too. Comes with a rubber sealing ring to prevent leaks. Installation isn't too tricky: drain and clean your reservoir, pop out the old glass, insert the new one with the gasket, and gently tap it into place (use a cloth to protect it). Then refill with brake fluid and bleed the brakes. It's made from durable glass that's wear-resistant and won't corrode from brake fluid. Super handy for DIY maintenance. Keep an eye on your fluid level for safety's sake – don't wait until it's a problem. Get your braking system back in clear view!