Weissenfels Techna/Weisstech Snowchains Size-1 Weissenfels TECHNA/WEISSTECH model is the ideal budget priced snow chain to keep in the car boot ready for use, whenever needed. Simply slip a pair of Techna/Weisstech chains over the driving wheels and you are ready to go in no time at all. As with all Weissenfels models, correct fitting and use is a simple operation, which only takes a matter of seconds per side and they won’t damage your wheels or tyres. Fitting Step 1 Fitting Step 2 Fitting Step 3 Fitting Step 4 Free Mainland UK Delivery.