Irwin 3557181C Bit Holder with C-Ring 3 in L 1/4 in Drive Hex Drive 1/4 in Shank Hex Shank Steel 1/CD

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.