"This 3-Pc. Impact Adapter Set is made of chrome vanadium steel for the strength and durability to handle heavy-duty impact applications. Pieces qty. 3, Extensions qty. 0, Adapters qty. 3, Storage Type None, Universal Joints qty. 0, Material Type Chrome vanadium, Drive in. 3/8-1. Chrome vanadium steel Laser-etched for easy identification Includes 1/2in.F x 3/8in.M, 3/4in.F x 1/2in.M and 3/4in.F x 1in.M impact adapters"
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