Felo 0715732120 Smart Blade - T10 Tamper Resistant Torx - T15 Tamper Resistant Torx, 6-1/2-Inch long Black tip for precision and fit 1/4" blades made from high-quality bit-steel, exceeding industry standards by up to 100% Made on 1/4" stock and can be used as long bits in any power tool Precision quality and great versatility Lifetime warranty - we will replace it free of charge