Wera 05135270001 851/9 C J 4mm Halfmoon Phillips Bits are high quality bits designed for phillips screws, but optimized for Japanese Phillups Screws. Wera 851/9 C J 4mm Halfmoon Phillips ® Bits feature a hard design and a 4mm Halfmoon Drive featuring Wera's Connecting Series 9. Wera 851/9 C J 4mm Halfmoon Phillips ® Bits PH 0 are modified according to the Japanese Camera Industrial Standard.