Type:WBCB01，WBCB02，WBCB03，WBCB04，WBCB05
WBCB01--Diameter of Dry core
bit: 68mm and 82mm
WBCB02--Diameter of Dry core
bit: From 50mm to 250mm
WBCB02--Diameter of Wet core
bit: From 32mm to
400mm---turbo segmented
WBCB03--Diameter of Wet core
bit: From 32mm to
40mm---regular segmented
