The Ryobi R18IW3-0 ONE+ Impact Wrench has a 1/2in square drive with locking pin for easy socket fitment. It’s high power motor delivers up to 400Nm of torque, ideal for fast tightening/removing of heavy-duty fasteners. The impact mechanism allows for high amounts of torque with little vibration feedback through the handle. It has 3 speed settings that provide added control and versatility. Mode 1: 0-2,100 rpm for precision work. Mode 2: 0-2,500 rpm for added control which helps prevent damage to fasteners and materials. Mode 3: 0-2,900 rpm for maximum performance for the toughest applications. Also has a Tri-Beam LED light, that eliminates shadows on bits and fasteners even in the darkest work areas. Bare Unit, batteries sold separately, compatible with all Ryobi ONE+ batteries. Part of the ONE+ system, one battery fits 100+ tools. Specification Bit Holder: 1/2in Square Drive.No Load Speed: 0-2,100/0-2,500/0-2,900/min.Impact Rate: 0-3,200/min.Max. Torque: 400Nm.Weight: 2.0kg.