1)Business Type: Manufacture and sale 2)Outside Diameter: R25, R32, R38, R51, T76,30/11, 40/20,40/16 3)Min. Order: 5 Tons DINGRUN High Pressure Hollow Anchor Bolt1.Self drilling anchor bolt 2.Common grouting anchor bar, 3. Stainless steel anchor bar 4.Kinds of diameter 5.R & T thread DingRun High Pressure Hollow Anchor Bolt