EC21 Product Catalogs - countersunk barrel bolt http://www.ec21.com/ec-market/countersunk barrel bolt.html Nuts & Boltshttp://ritesh009.en.ec21.com/Nuts_Bolts--563321_905452.htmlbolt Plain, Black, Z/P, HDG DIN 604 Flat countersunk nib bolt Plain, Black, Z/P, HDG DIN 605 Flat countersunk (long) sq20060127