240mm diameter. Arms, when extended, open to 420mm. All stainless steel construction. Coarse mesh has an aperture of 1.5mm and the fine 0.5mm. Depth of top strainer is approx. 40mm. these are very nice strainers which will filter your honey to selling standard. They have extendable arms which means it fits perfectly over both our 40kg honey tank or our 80kg honey tank.