The Wera 43 Piece 3/8" Drive Metric Chrome Socket Wrench Set (05003594001) features the Zyklop Ratchet, which combines 5 ratchet types into 1 robust tool. Swivel head has defining lock points at 0, 15 and 90 degrees left and right, preventing the head from slipping, for reliable and safe working. Combination of freewheeling sleeve and rotating mass design turns nut or screw with unbelievable speed at 0 degree position. Add adaptor and bit and ratchet can be used as conventional screwdriver. Features easily accessible thumbwheel that reverses direction in any position. Sockets feature distinctive knurling for easy manual tightening. Premium extensions are fitted with Wera's flexible lock system preventing slipping or accidental disconnection and loss of tool.