Two hex nuts fasten the 7.9mm (5/16") diameter rod to the base. Offset rod mounting to the 20.8cm (8 3/16") diameter leaves area for larger containers. Use with temperatures from 135°C to -135°C (275°F to -211°F). Simple assembly required. Autoclavable at 121°C (250°F) Shipping weight: 1.66 Lbs.) Polycarbonate base is strong and steady and supports a 46cm (18") tall stainless steel rod. Ideal for corrosive environments. Suitable for use with all standard laboratory clamps.