The Wera Tools "Joker" combination wrench comes in 10mm, 13mm, 17mm and 19 mm sizes. The combination wrench features a holding function for nuts and bolts, limit stop that prevents the wrench from slipping off the bolt head, hardened metal plate with hard tips that "bite" into the bolt, return angle of 30 degrees and box-end ratchet with 80 teeth. The tool's features combine to prevent any unpleasant slipping, even at higher torque.
