Lisle's Dual Drive Stubby Metric Hex Bit Set, No 69000, works well in tight spots including drain plugs, head bolts, caliper bolts and many other applications. Constructed of a dual-drive design, these bits can be turned with a 1/2" square drive from the end or using a 1" open end, box end or ratcheting wrench. The collar keeps wrenches from slipping off. Bits are made of heat-treated alloy steel for strength and are stamped with the driver size. Only 1.63" in length. Sizes include: 10mm (No. 69120); 12mm (No. 69130); 14mm (No. 69140); and 17mm (No. 69150).