OMS Aluminum Weight Belt Harness Buckle A24518002 OMS Light Weight Aluminium Buckle for use with 50mm � 2 Inch Webbing Weight Belts & Tech Harnesses. Corrosion Resistant Anodized Aluminium & Heavy Duty Pinned Hinge ensures a durable Product. May be used for many other purposes where Strength, Low Weight and Corrosion Resistance is required.