Upgrade Your Windows with Roto NT A, K and R Royal TBT Drive Gears Enhance your windows with the premium Roto NT A, K, and R Royal TBT Drive Gears featuring a sleek silver finish. These drive gears are designed for sash windows with a backset of 15mm and sash rebate heights ranging from 1601mm to 2000mm. Key Features: Compatible with 9mm & 13mm eurogroove axis Suitable for both surface and concealed fixed systems Non-handed design for versatile installation Benefits: Effortless Operation: Smoothly open and close your windows with precision Enhanced Security: Ensure the safety of your home with reliable locking mechanisms Customizable Design: Adapt the drive gears to suit your specific window requirements Elevate the functionality and aesthetics of your windows with the Roto NT A, K, and R Royal TBT Drive Gears. Upgrade to a superior window experience today.