General description Mini hexagonal quick-action drilling head designed for cordless screwdrivers, compatible with drill bits ranging from 0.3mm to 6.5mm. This set includes two pieces for versatile use. Technical specifications Installation Size: Compatible with drill bits from 0.3mm to 6.5mm Universal hexagon shank Installation Simply thread the quick change adapter with a 6.5mm hexagon shank into the power drill Converts impact drivers to hold drill bits and screwdrivers Usage Easy operation with simple locking and releasing of drill bits No spanner required for operation Other information Package Contents: 1 black mandrel + 1 silver mandrel