Use with 1/2" drive or 21mm wrench.Made of steel.Contents:17PCS oil filter socket: JTC-1114, 1021, 1235, 4695, 1521, 4611, 1403, 4160A, 1522, 4452, 4668, 4612, 4904A, 4859A, 4571, 4352, 4353.1PC offset wrench: 21mm/12PT.