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. -6pc set / 12 different sizes SET INCLUDES THE FOLLOWING -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 -12 Sided / Bi-hex sockets for added grip and strength -Also double hex design gives great grip at either end making sure there is no slipping when tightening and loosening -Supplied in a canvas tool roll for easy storage and transportation.