Aluminium box section construction with extruded body and solid block vials for strength and durability. Includes rotating vial for specific angle measurement and magnified centre vial. Also features earth magnets and a v-groove base for use on metal and rounded surfaces. Shockproof, over-moulded rubber end caps. Aluminium Box Section Frame Non-Magnetic Base 1 x 90° & 1 x 180° Vials & 1 x 180° Rotating Vial Magnified Centre Vial ABS Vial Casing for Protection Shockproof Rubber End Caps 1 Year Guarantee Aluminium Box Section Frame Non-Magnetic Base 1 x 90° & 1 x 180° Vials & 1 x 180° Rotating Vial Magnified Centre Vial ABS Vial Casing for Protection Shockproof Rubber End Caps 1 Year Guarantee