- 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. - 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.