Applicable to the caliber on the lamp pole: M20/M25/M30/M40/M50/M60/M80: 60-110mm, 65-95mm recommended; M100/M120: 70-76mm recommended (free customization upon request); G10/G20/G30: recommended 65-70mm G50/G80: recommended 70-76mm; PD-30W/PD-40W/PD-50W/PD-60W: 65-70mm recommended; PD-80W/PD-100W/PD-120W: 70-76mm recommended; JKC series: 65-68mm recommended; J20/J30/J50: 55-80mm (65-73mm recommended); ZC series: 60-65mm recommended; FX series: 70-76mm recommended.