The Snap-on 1/2" Drive 17mm Subaru Caliper Bolt Impact Swivel Socket, No. BTCS1, is designed to allow technicians to reach obstructed front caliper bracket bolts. The BTCS1 impact-rated, swivel socket was produced to specifically meet the needs of technicians working on Subaru vehicles. Its special geometry and swivel design give access to front caliper bracket bolts that are blocked by suspension components and allows for the use of a 1/2" drive impact gun. Made from special higher alloy steel, the socket is precision-built and heat-treated for optimum strength and durability plus its industrial finish helps protect against corrosion.