Feature●Made from rugged S2M tool steel, 100 pct made in the USA, custom heat-treated for strength and durability●Manufactured to tight tolerances to ensure accurate fit and full fastener engagement●Insert bits have a retaining ring notch●Fits all standard multi-bit screwdrivers and power drills●Custom heat-treated for strength and durabilityDescription Features Made from rugged S2M tool Steel 100% made in the U. S. A. Custom heat treated for strength and durability Manufactured to tight tolerances to ensure accurate fit and full fastener engagement Insert bits have a retaining ring notch Power bits have a power locking groove Fits all standard multi-bit screwdrivers and power drills.