20 Swivel Lanyard Hook Snap Lobster Clip Clasp Lanyard Chain Holder Diy 37x9mm Full 360 degree swivel eye helps prevent tangles. Total Length (Approx.): 1 1/2 inch ( 37 mm ) Inner Ring Diametre (Approx): 3/8 inch (9 mm) Material: Steel, Nickel plated Inclube: 20 x Keyring