Use the Adjustable Extension Strap with the upper anchorage / top tether strap on child restraints. When required, use the extension strap for additional length to reach the vehicle anchor point. The Extension Strap adjusts from 200mm to 900mm. This is ideal for when you are unsure of the amount of length required. Additionally, this means it will suit most vehicles. It is suitable for child restraints manufactured from March 1993 onwards that have a snap-hook connection.