This counterweight will fit the following mounts: all CEM70, CEM60, iEQ45, and their variance, new version CEM40 and GEM45 which with 28 mm shaft (older CEM40/GEM45 were with 20 mm shaft), and any mount with 28 mm shaft. Please check the counterweight shaft diameter of your mount before place order. Weight: 9.5 kg (21 lbs) Outer diameter: 5.78" (147 mm) Inner diameter: 1.11” (28.28 mm) Height: 2.95" (75mm) Color: Black