Four and five hammer hammer pit pit difference
The five pit is the BOSCH patent to produce this kind of hammer to buy patents to BOSCH can. Four pits are everywhere, and every household can produce it.
Five: refers to the pit slot number is five at the handle of hammer drill hole, three key and two ball groove, used in the five pit on the hammer. This drill is usually used in the heavy hammer.
Four: refers to the pit slot number is four at the handle of hammer drill hole, two key and two ball groove, used in the four pit on the hammer. This drill is usually used in the medium electric hammer.
