Clamp Retort - 3 Prong, Chrome plated-EIS-CH0684A offers a thoughtfully designed, durable resource for hands-on learning. PVC coated diecast jaw, with clamping tommy-bar screwthroughÂÂ swivels, mounted on 13.5 cm rod. of dia. 8 mm jaw capacity 90 mmÂÂ and overall length 25 cm.