I was thinking it is one piece holder but actually it comes in four parts and a bag of screws. There is a detailed instruction but you still need to control the distance by yourself. The product quality is good and works well for holder function. Overall I think this wine glass holder is unique and in good quality. Disclaimer: I received a sample product for review purposes. The Company/Seller did not influence in anyway how I rate this product. What I wrote in my review, whether good or bad, is voluntary and entirely my own with the intent of helping Amazon Customers make the right buying decision.