The SV219 dovetail plate mounts bolts with a 27mm continuous groove that easily accommodates any bolt spacing and balance needs. Strong and sturdy; The SV219 telescope dovetail mounting plate is housed precise and machined from aluminum alloy and black anodized to a hard finish and the dovetail is more durable and the service life is extended. SVBONY SV225 Alt-Azimuth telescope mount is the ideal visual astronomy travel companion and strong practicality. Lighr weight and compact design are convenient for customers to carry out. UNC 3/8 -16 thread specification is compatible with Celestron/Skywatcher/Orion/Vixen & most mainstream astronomical OTAs. Standard vixendovetail. You can use it with most telescopes. 10KG load bearing makes sure you can have a smooth load operation even with the MK105 SV550 80mm 122mm. Adjustable all-round viewing angle，observe as one pleases. Helical turbine drive supports 360° all-round adjustment, :-60° to +60° altitude adjustment, all-round visual adjustment angle to meet your visual observation needs. Fine-tuning control lever is designed to meet the adjustment efficiency of customers in different scenarios.