Wera 05160976001 899/4/1 1/4'' Hex S Universal Bit Holder w/ Strong Retaining Ring is for the take-up of bits with 1/4'' hex head drive as per DIN ISO 1173-C 6.3 and comes with a stainless sleeve for special corrosion protection. The particularly strong retaining ring ensures an optimum fixing of the tool in the holder. The especially strong permanent magnet makes sure that the bits are held absolutely securely. Wera 899/4/1 1/4'' Hex S Universal Bit Holder With Strong Retaining Ring is suitable for holders as per DIN ISO 1173-F 6.3.