High polish, smooth-finish, heat-treated chrome vanadium steel. Tools are longer than standard combination wrenches to enable access to hard to reach places. Packaged in a kit bag Includes sizes: 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm wrenches.