Description Pro-Link Hercules Series Retract Cylinder With T-Bar – For Nose – Nipple 90deg to Mount  Nose Retract Cylinder with T-Bar – Hercules Series Replacement Cylinder for all Pro-Link Hercules Series Retracts. Complete with T-Bar. Note: One Nipple 90 Degrees to Mounting Point and T-Bar. Cylinder length: 5 cm Cylinder diameter: 2 cm