"The few of these bits that I have bought proved very durable. I haven't worn one out yet only replaced a lost one and lent them to other people. They will only 'cam out' on worn screw heads but if you press harder and slow start you should be OK. The price is fair and one of these will outlast many cheaper alternatives so they are good for regular DIY"
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Review 2 for Wera Bi-Torsion Extra Hard Gold Pozi #2 50mm
"Managed about 20 screw before snapping off! I use quite a few of this type of thing (I find the 50mm ones particularly usefully) and would gladly pay that little extra for a quality item. This last far less than my normal quality item not a quality item, very brittle."