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Use this extension tube for getting the correct image scale or the exact spacing required for reducers or field flatteners. Please Note : This is M42 (42mm) thread caliber , not M48 thread caliber. Fully metal construction and anodizing aluminum process , durable for long time use. Please make sure this is the correct size and thread before purchasing; If you have any problems about your purchase , please don't hesitate to contact us and we'll make it right. The extension tube has a T2 interior thread and a T2 exterior thread for solving spacing problems in astrophotography and eliminates a range of focusing problems.