With inside taper as per DIN 228, self-retightening.

Usage: Keyless drill chucks for self-guided drilling machines and drill presses with tapered holder. The drill bit can be clamped by hand simply and quickly.

Cone:
B10...B16: normal
B18A: shortened by 7 mm

Appropriate accessories:
342500 ROEHM Insert cone
342540 Insert spindle

Usable with:
583503 Bench drill FLOTT
583505 Bench drill FLOTT
583510 Bench drill FLOTT
583620 Boring and milling machine PROMAC