Park Tool HCW-11 Adjustable Cup Wrench The HCW-11 Adjustable Cup Wrench fits slotted bottom bracket adjusting cups and cups with raised 16mm wrench flats. These are common on older English bicycles and many department store bicycles. The opposite end of the wrench has two ears that are 23mm wide and approximately 5mm wide. Features HCW-11 fits "slotted" bottom bracket adjusting cups and cups with raised 16mm wrench flats Common BB's on older English bicycles, and less expensive bicycles Opposite end has two ears that are 23mm wide and approximately 5mm wide Manufacturer's Part No: HCW-11 UPC: 763477004116 | Park Tool | Hcw-11 Adjustable Cup Wrench Hcw-11