This device hooks over the edge of a worktop and the jar or bottle is then placed in the V. The object is clamped by the wooden arm, which can be pushed with the stomach or hip, leaving hands free to twist the top. The device is made of moulded plastic with non-slip feet and rubber lining. Can be used with most openers. Suitable for jars up to 120mm (43/4) diameter. Weight 580g.