Mac Tools Metric Combination Wrench Sets, Nos. SCLM14PT, SCLM5PT and SCLM5XLPT,offer an I-beam design for maximum strength and comfort, according to the company. The non-slip, open-end design of the wrenches in these sets prevent the rounding off of fastener edges by keeping the wrench firmly on the fastener. The wrenches have a polished finish and double-offset heads for ease-of-use. The wrenches are available in a 14-pc set that includes 6mm through 19mm sizes, a 5-pc set with 20mm through 24mm sizes and a 5-pc set with 26 mm through 28mm, 30mm and 32mm sizes.