The Magnetic Base (9.3 mm diameter support) is a machined brass piece fitted with a magnet. The base fits into the goniometer head, providing a secure base for the CrystalCap System™ sample holders. Fits most goniometer heads. The Magnetic Base is available in two strengths: strong and medium. The stem of the magnet is 3 mm in diameter. The length of the stem is 5 mm. The thickness of the platform is 3.6 mm.