Wera Zyklop 250mm Extension With Flexible Lock For 1/2" Drive Ratchets - 003643 This Wera 8796 LC Top Extension will fit any ratchet with a 1/2" square drive system to quickly provide extra working length when needed. The flexible lock system allows the extension to be locked into the drive handle to prevent it from slipping out of the ratchet, especially during high torque applications. Made from chrome vanadium with a brushed chromium plated finish, the extension has a freewheel sleeve that allows you to provide extra support while driving or removing fasteners. All sockets or accessories with a 1/2" square drive are suitable for use with this extension.