This EAB Guide Collar Phillips Impact Bit Driver features a guide collar for better holding power and a milled finish for an improved fit. Made of heat-treated S2 spring steel, this square impact bit driver has a hardened tip for superior strength and durability. This industrial-quality square impact bit driver has a reduced, rounded shank for improved balance and reduced vibration while you work. Torque tested to ensure a higher breaking point. Recyclable for a better environmental footprint.