Cottarelli Bobbin Hanger is an accessory made entirely of stainless steel. It can be combined with only all the Cottarelli vise based on C-clamp, including the Cottarelli Standard Vise. It is already included in the Cottarelli T-Rex Vise Kit. It allows you to comfortably rest the bobbin threader away from the hook during periods of inactivity, and then take it back later. Handcrafted in Italy.