StarSide 10pcs Smooth Spinning Swivel Hooks Clips Work Great for Wind Spinners, Spiral Tails, Bird Feeders Etc. Smooth Spin Highly Weather Resistant Stainless Steel Work Great For Wind Spinners, Spiral Tails, Bird Feeders Etc Dimensions: total length 8.5 cm. S-Hook is 4.5 cm from top to bottom, and the swivel & clip is 4cm Holds up to 6 pounds