material:These greenhouse clamps are made of stainless steel(Note:The spring part is not stainless steel),sturdy and .They are more than the wood clips or plastic clips.The clips snapped on easily and held the frost blankets and greenhouse cover in place through high winds and heavy snow. Suitable for many hoops of different thickness:This garden clips have good spring action and strong grip,Diameter in closed state 0.47 inch,Maximum diameter in open state 0.98 inch,Can be adapted to many different sizes of greenhouse hoops,poles,pipe or stands. Multi-use product: These greenhouse clips strong enough to hold down the netting on your raised garden beds or row cover on your garden hoops when it's a windy day.They be helpful to anyone who wants them for garden use. from garden use,they make great food bag closure clips,clothespins,binder clips,photo clips,cord clips for hanging up string lights,etc. Good spring action: garden clips has a thick spring,which has good spring action and can be adapted to most different sizes of garden hoops,stands,pipe or poles.Easy to open and strong.These greenhouse clamps have a strong grip and not disintegrate like plastic. Size of the clamp:Length . 2.1inch.