Stainless Steel Cat Claw Fits over your finger via three stainless steel rings. Contains two Stainless steel Pinwheels for intense sensations and scratching. Size: 1st smaller ring is UK size N, US size 6.5 and EU size 53.5. About 17.12 mm. 2nd larger ring and 3rd ring are UK size Y, US size 12 and EU size 69. About 21.49 mm. The Cat Steel Claw has a comfortable fitting allowing manoeuvrability.