Wiha 39134 is a CentroFix SuperSlim quick-release magnetic bit holder with a 1/4" hex interface. The slim body improves access in confined recesses and around adjacent hardware. Magnetic retention holds 1/4" hex bits securely during driving, and quick-release simplifies bit changes without tools. Typical use is on cordless and pneumatic drivers for panel building, cabinetry and general service work.