Extendable Hinged Bow RollerExtendable Hinged Bow Rollers have a hinged base which allows for shorter or longer overall extension.Extendable Hinged:A - 198mm (7-13/16")B - 125mm (4-15/16")C - 73mm (2-7/8")D - 101mm (4")H - 75mm (2-15/16")H1 - 239mm (9-3/8")L - 527mm (20-1/4")