GearWrench 85021 21mm XL Ratcheting Combination Wrench Surface Drive Plus provides stronger grip on fasteners, nearly eliminating fastener rounding Oval shape beam provides improved comfort Ratcheting box-end needs as little as 5 degrees to move fastener VS. 30 degrees for standard box end wrenches Up to 25% longer delivering up to 25% more torque for those hard to reach fasteners Surface Drive Design provides improved box end strength