EISCO 4 Prong, Cork Lined Clamp on Swivel Bosshead - 4.1" Max Clamp Opening, Bosshead fits up to 18mm Rods - Zinc Alloy Clamp - Research, Industrial Laboratory Grade
Eisco Labs Industrial Series Retort, 4 Prong, Cork Lined Clamp with swivel Boss Head, 10.5 cm maximum clamp opening