(1)double head bolt (2)according to customers' drawings (3) ... .35&45 steel (5)plain,black,zinc,hdg Name:double head bolt:Model:ss5, ss8, ss25, ss36Size:D3/4 ... 4.8, 8.8Surface: plain, zinc, black, hdgPack:Double-layer woven bag+Free fumigation wooden palletUsed on wooden sleepers ... bolt /Inserted bolt/Track bolt/Fish bolt/Square bolt/double head bolt . Type : All kinds available available according to ...