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Tough viscous Wera bits for hexagon socket screws and universal use. ΒΌ" hexagon, suitable for holders as per DIN ISO 1173-D 6.3. Features and Benefits • For Phillips screws • Ductile and tough for hard materials • 1/4" hexagon, suitable for holders as per DIN ISO 1173-D 6.3 • In a practical 3-piece set Contents 1x 851/1 Z SB bits, 3 pieces; 3x 851/1 Z bits: PH 1x25, PH 2x25, PH 3x25