are used with square drive wrenches. Their design allows more than two inches of clearance over ends of shafts and spindles. They are made of hardened alloy steel to be as durable as any socket made.These spanner sockets are long overdue. Whittet-Higgins provides them in keeping with its long tradition of best quality and unsurpassed service for a better life for all who wisely specify Whittet-Higgins products.