This plastic multisize ring gauge is ideal for self finger sizing. The multisizer works like a belt, forming a ring and then placing over the finger, adjust to give a comfortable fit. The sizer should comfortably go over the knuckle but be tight enough not to come off. When you have your size simply let us know or send a photo of the size if you are unsure regarding half sizes. This multisizer is marked with British Ring Sizes A-Z and we can match your size to ensure your ring fits you exactly when we make it.