IRWIN 3557123B Bit Holder with C-Ring, 1/4 in Drive, Hex Drive, 1/4 in Shank, Hex Shank, Steel

Designed for insert bits only. Can be used with socket wrench or socket adapter. Made of shock-resistant tool steel. C-ring design has internal clip that fits into retaining ring notch of insert bit to hold bit securely in place.