Wera 851/21 4mm HIOS Direct Drive Phillips Bits - Wera 05135284001, This 4mm HIOS direct drive bit from Wera has a 40 x 1.8mm shaft and is suitable for use with Phillips size PH0 screws. Wera 05135284001 851/21 4mm HIOS Direct Drive Phillips Bit PH0/40/1.8mm
