diameter standard dowel sizes. 16mm, 20mm, 24mm 30mm, 32mm,60mm Available in 4 standard lengths: 400mm length: 16mm & 20mm 450mm length: 24mm & 33mm 500mm length: 16mm & 20mm 600mm length: 16mm & 20mm DOWELS MANUFACTURED : AS/NZS 3679.1, Grade 300 steel. STANDARD : Hot dipped galvanised to AS/NZS 4680 as standard. SIZE : Custom lengths available upon request. Minimum order quantites will apply.