Makita P-49971 PZ2 Hex Insert Bits 25mm (Candy Tub of 100), Silver, 8 x 6.8 x 6.8 cm
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one of these lasts me over a year usually, working full time. diy should last a long time
Just remember driving big screws puts enormous forces on bits so they will break
best bits i have found, and i have tried them all
about 12 notes on amazon
Are you using them in an impact driver or a drill driver?