Professional tool for commercial or occasional use. Manufactured from chrome vanadium steel for strength and durability. Very useful set, can provide high torque when required and then quickly spin off the fastener. Includes; 8mm x 9mm, 10mm x 11mm, 12mm x 13mm, 14mm x 15mm, 16mm x 17mm and 18mm x 19mm. Double flexible socket so ideal to reach into those awkward hard to reach areas Supplied in a canvas tool roll for easy storage and transportation.