φ23.8mm 9/16-18UNF 1/2--20UNF
φ19.0mm 4-M10×1.25
22.22mm 2-M10*1
23.81mm 2-M12*1
22.22mm M10*1 M12*1
20.64mm M10*1 M12*1
22.22mm 4-M10*1
26.99mm 2-M12*1