C r clarke fj0600 fj1000 fj1500 folding jigs c r clarke fj0600 this folding jig from c r clarke is a useful accessory to their range of strip heaters the jig has a working length of 600mm and is adjustable from 160deg obtuse to 30deg acutethe jigs calibrated protractors ensure consistent setting with hand knobs for easy adjustment the adjustable work stops can also be used to hold the material in the folding jig allowing the operator to continue with other work while the folded