machine screw anchor 1) Compective price and high quality 2) ISO9001 certificate 3) Best service Machine screw anchorIt was made by 2 parts, the material used the dfferent.After install 2 parts, the goods phot, see belowSpecification, see belowSize Weight/1,000pcsIf you are interested, feel free to contact me.Here we do our best to let us to win and share the market.Thanks a lot!