Model Number: GFC-190, 165, 165A Brand Name: Huayang Key Specifications/Special Features: GFC-190/165/165A azimuth circlefor magnetic compassGFCserial azimuth circle for magnetic compassare used for all specifications of marine class A magnetic compass.GFCserial azimuth circles are designed and manufactured in accordance with shipbuilding industry standard GB/T 335-2005(marine compass azimuth circle)Specification Type Inside diameter Outside diameter Net weight GFC-165 226mm 239mm 1.5kg GFC-165A 247mm 260mm 1.7kg GFC-190 247mm 260mm 1.7kg