FREE SHIPPING. SEE PICS. The Matco Tools 3/8″ Drive 12″ Knurled Handle Locking Extension #BX12KL is a single, high-quality tool designed for automotive and industrial applications. With a durable 12″ knurled handle, this extension provides extra reach and leverage for tough jobs. The locking feature ensures a secure connection to your ratchet, making it a reliable and essential addition to any toolbox. Made by the reputable brand Matco Tools, you can trust in the craftsmanship and longevity of this extension.