Craftsman 4-PC. Metric Open End Ratcheting Wrench Set # 21937 Fits into tight spots with the open end without taking the wrench off the fastener. 8 Common Metric Sizes - Makes jobs faster and easier. Set Sizes Include: 8 x 10 mm, 13 x 14 mm, 15 x 16mm and 17 x 19mm Lifetime Craftsman Warranty