Allied Electronics Corporation offers Aluminium Alloy Proactive Metal Caps. Allied Electronics Corporation is an ISO 9001: 2000 certified company. The Aluminium Alloy Proactive Metal Caps of model number MS 25043 include internally threaded metal dust caps used to protect MS 3100, MS 3101 and MS 3102 styles. These are supplied with sash chain. The Aluminium Alloy Proactive Metal Caps are available in sizes like, 10SL, 12S, 14S, 16S, 16, 18, 20, 22, 24, 28, 32, 36, 40 and 44.