840/4 IMP DC Hex-Plus DIY Impaktor bits, 6 x 50 mm, 5 pieces 5x 840/4 IMP DC Impaktor bits: 6 x 50 mmHigh quality Impaktor bits for hexagonal socket screws. The Impaktor technology offers an above-average service life even under extreme circumstances. Enhanced friction resistance, thanks to the rough diamond-particle coating on the bit tip, prevents any