Features and Benefits: Special self tapping splines provide maximum grip to remove stripped lug studs; Use with TR1, TR98 truck wrenches; Can also be used with an open wrench; Use with a soft faced hammer; Fits 13/16" square inner nut; Special self tapping splines provide maximum grip to remove stripped lug studs Use with TR1 and TR98 truck wrenches Can also be used with an open wrench Use with a soft faced hammer Fits 13/16 in. square inner nut