The speed form makes it easy to pick up and remove the donut adapter safely and quickly after you want to put on or take it off with your fingertips. Minimizes accidental drops on the binal. The donut hole diameter is 1.5 inches (38.0 mm) and is finished with a precise diameter of 1.5 inches (38 mm) that fits almost no gaps. For that reason, when using the domestic board with precise round holes, it can be easily rattled by gap when scratching or cuing. Moderate height to prevent your fingertips from coming into contact with when you are queing or scratching. Aluminum shaving, anodized champagne gold color finish.