MAC TOOLS Mac Tools Impact Driver "M-shock" Complete Set M-shock grip and #2, #3 blades DPM2S The "M-shock™™" impact driver, which rotates when struck, is effective on "rusted screws," "stripped screws," and "seized screws"! It incorporates a rotation mechanism with the same weight as a general-purpose impact driver. The blades are made of strong and durable chrome vanadium steel. The grip is an easy-to-grip pentagonal "Penta-Grip" that can also be used for tightening work. The design incorporates a cam rotation structure in the through-unit, which causes the tip of the blade to instantly rotate 12° in reverse when struck by a hammer. Because impact acceleration is applied to the blade tip when struck, force is applied to even rounded screws, increasing the certainty of loosening work. The unit-integrated grip is very lightweight compared to conventional impact drivers, and it incorporates a rotation structure with a weight not much different from that of a through-driver, so you can use it without hesitation and quickly. Of course, tightening work is also possible. Although it is difficult to see in the image, some of the paint from the spring has peeled off and is scattered inside the grip. (Image 3) Please check the images carefully for scratches, dirt, etc.