With strong permanent magnet and quick-change chuck (Rapidator technology). Extra strong ring magnet (holds even long and heavy screws). Automatic locking. Sliding sleeve (makes it easier to position screws). Suitable for 6.3 mm (1/4″) C 6.3 and E 6.3 bits (also for long bits)Drive: 6.3 mm (1/4″) hexagon DIN ISO 1173-F 6.3Drive: 6.3 mm (1/4″) hexagon DI