These Crow\'s Foot Spanners are suitable for use with extension bars and ratchet wrenches The Siegen S01043 3/8\" Sq Drive Flexible Crow\'s Foot Spanner Set contains sizes 10-19mm and is suitable for use with extension bars and ratchet wrenches. They are ideal for applications where access is limited and various angles are needed. Features:  Suitable for use with extension bars and ratchet wrenches  Chrome Vanadium, 3/8\"Sq drive, flexible head crow\'s foot spanners  Heat-treated, hardened and chrome plated with a fully polished finish   Ideal for applications where access is limited and various angles are needed  Comes with: Sizes: 10, 11, 12, 13, 14, 15, 16, 17, 18, 19mm  Specifications: Drive: 3/8\"Sq Nett Weight: 0.92kg