This dip stick (dipstick / aka oil stick) commonly (though not exclusively) applies to 50cc-150cc engines. Most commonly used for 50cc, 90cc, 125cc and 150cc GY6 engines in many applications including scooters, buggies, carts, automatic kick start ATVs and dirt bikes. Approximately dimensions are:
Total Length: 10.8cm
Thread Diameter: 1.8cm