Quantity: 150 pieces Size: #4 x 5 Overall length approximately 14mm x 15mm Weight capacity: 30kg This has a similar size and feel to NT Power Oyako's 5x6 to 4x5. Compared to NT Power Oyako, the connecting ring is smaller, and it's generally the same shape and size as the swivel used in Daiwa and Yamashita's flounder rigs. The seller uses the medium size for making rigs for live bait fishing for flounder, as well as for ama-dai and thornyhead. Smaller sizes are available for vertical contact and squid fishing, and larger sizes of parent-child swivels are also sold for deep-sea fishing such as for blackthroat seaperch, so please consider those as well. Sold in packs of 150. We also sell in smaller quantities. Please check the stock of parent-child crane swivels from #Oyako-Crane-Swivel. *There is a set discount if you wish to purchase two or more items. Please see the profile for details.