Stainless Steel Counterweight Shaft for Astronomical Equatorial Mount Stainless steel counterweight shafts of 164mm, 314mm, and 470mm (combined), with a shaft diameter of 20mm. External thread M16 is suitable for equatorial mounts such as SAGTI, XYGTI, HEQ5, EQ6R, EQ3, EXOS - 1, EXOS - 2, AVX, and Xinda harmonic equatorial mounts. External thread M12 is suitable for products such as 80EQ, 80DX, Celestron PS and AM series. The 470mm (combined) counterweight shaft is suitable for Xinda W150i - B00/W100i - B00 harmonic equatorial mounts and others.