The Broadfix U Packers have been manufactured with a high percentage of post-industrial and post-consumer recycled material. As they are made from plastic they will not swell, shrink or rot and they are completely waterproof. Capable of withstanding higher compressive loads than traditional timber flat packers. This also makes them more economical. They are colour coded depending on size, for easy identification. The ever popular U-Shim is perfect for shimming behind a screw or fixing – loosely install the fixing, and then simply slide the required number of U-Shims over the fixing. The unique comb/clip prevents the U-Shims from falling out, which leaves both hands free to tighten up the fixing.Broadfix U Packer Mixed Bag contains the following: 140 x Small U Packers 55 x 43mm. 60 x Standard U Packers 101 x 143mm.