System of Measurement: Metric. Number of Pieces: 11. Cornwell CRW-19MF 11 Piece Metric Ratcheting Combination Wrench Set – 8-19mm. What’s Not Included. This wrench set was previously owned. The product is tested, working and in good condition with slight scuffs, marks and light cosmetic wear. Some minor rusting on the 15mm wrench. See photos for details.