The Proto USA 6435 11/16 Offset Cylinder Head 12-Point Obstruction Wrench is a high-quality hand tool designed for automotive use. Made in the United States by the trusted brand Proto, this wrench features a unique offset design for improved access to tight spaces. With a 12-point drive type and SAE measurement system, this obstruction wrench is perfect for removing and installing cylinder heads. The sturdy construction and precise sizing make it a reliable addition to any mechanic's tool collection.