Replacement 5 cm adjustable scull core. For use on sculls that feature the Length Adjustment system. Does NOT include grip. Sold individually. 
Not for use with fixed length sculls.
Important:
This part does not include the grip. They are intended to be used with a grip, but we offer this option for people who plan to use their own or another manufacturer's grips on their oars.
You will need the Concept2 Oar Rigging Tool (part number 7034) or a T20 6-Lobe driver (available at hardware stores) to install and adjust these grips.
Sold individually.