12.7Sq. (1/2") Bit Holders

DC-4S
Quick change chuck Type

It can put on and off a bit when pulling the sleeve, and the bit is fixed when reversing the sleeve.
DC-4R
Rubber holding Type

The rubber holds a bit.
DC-4B
Ball lock Type

The steel ball and steel the band holds a bit.
DC-4
Ball lock & Guide sleeve Type

The sleeve does not slide.

Part No.	Sq.(mm)	Type	Applicable Bits
DC-4S	12.7	Quick change chuck	B-30
DC-4R	12.7	Rubber holding	B-30 B-40
DC-4B	12.7	Ball lock	B-30
DC-4	12.7	Ball lock & Guide sleeve	B-30

DC-4S Quick change chuck Type