Hangon Masking Tubes are suitable for screws and shafts that only need their sides masked. They are great for screw sizes ranging from M3 to M12. Masking Tubes are made from silicone. Masking Tubes are used for short screw lengths from 20mm to 45mm. They come with a grip design to facilitate easy installation and removal. Masking Tubes are durable and yet economical to use.