These specially designed packers ease the packing of Ultrapak™ knitted cord. Their thin edges and fine serrations sink into the cord, preventing it from slipping off and reducing the risk of cutting the gingival attachment. 45° to handle: Our most popular packers, with heads at 45° to the handle and three packing sides. Circular packing of the prep can be completed without the need to flip the instrument end to end. Use the small packer on lower anteriors and upper lateral incisors. 90° and parallel to handle: Same size and three-sided heads as the 45º to handle packer, except one of the heads is in line with the shank and the other is at a right angle to the shank.