Deep design is ideal for recessed and long-threaded fasteners Dual indexing flex head design reversable 72 tooth ratcheting wrenches Deep design is ideal for recessed and long-threaded fasteners combining the functionality of a pass through socket and a ratcheting wrench head is fully repairable Spline drive works on 6pt/12pt/Torx/Torx Plus, 8-10mm, 9-11mm, 12-14mm, 13-15mm, 17-19mm