All Storz heads are forged 6061-T6 aluminum to Spec. SAE-AMS-QQ-A-367 and ASTM B247. Also complies with DIN standard. Stainless steel lock assembly on all 4 or 5 Storz. 30 degree elbow made from tough, lightweight 356-T6. Cast elbow has powder coated silver finish. All Storz heads and threaded connections are harcoated anodized to MIL-A-8625 Type III, Class 1. NO PLAIN ANODIZE, PAINT OR POWDER COATED FINISHES ON CONNECTIONS!!! NO CAST HEADS!!!