(1) Hipshot black HB7 bass string ferrule.  Overall Height: 0.427" (10.9mm); Lip Height: 0.099" (2.5mm); Lip Outer Diameter: 0.875" (22.2mm); Barrel Outer Diameter: 0.720" (18.3mm); Barrel Inner Diameter: 0.562" (14.3mm). 

Part # BSF-HB7-B