... , 19mm, 21mm, 22mm, 23mmCertificationISO9001:2000, CE, SGS British Type Forged Scaffolding Internal Joint Pin :1) Material: Q2352) Surface: Zinc Plating ... ,nuts and washers. 4.robust design ade from drop forged steel or pressed steel for durability and reliability. 5.hot dip ... ,nuts and washers. 6.robust design made from drop forged steel or pressed steel for durability and reliablity. 7.hot dip ...