PB Swiss Tools develops and produces hand tools with uncompromising Swiss Quality: precise, durable, and reliable. Anyone, from professional craftsmen to DIY hobbyist, will appreciate these excellent tools and instruments. These tools are 100% Made in Switzerland and come with a Lifetime Guarantee (excluding Torque Tools which are limited to a 3 year warranty starting with the purchase date). Work with the best. Long, Ball-end Hex Key with Retaining Ring, size 4mm