Our deluxe line of two prong burette clamps are made of pressure die casted zinc alloy and are chrome plated. Adjustable to hold up to 60mm OD burettes, these clamps feature double keyed spring type adjustments. Available with an extension rod 8 ¼" (22cm) long, 5/16" (0.8cm) OD, with an overall length of 12 ¾" (32cm), Or with a boss head clamp that can swing freely and is lockable at any angle up to 360°, and can be used with rods up to 19mm. Recommended maximum working temperature is 60°C for the cork lined version, 80°C for the PVC version, and 280°C for the silicone sleeve version