Spring for fitting over pilot drill. Spring pushes core out of hole saw after completion of the cut.
Other specification is also available according to your requirement. (OEM, ODM )
Head Office: RM 14B 14/F WAH HEN COMM CTR NO 383 HENNESSY RD WANCHAI HK
Factory Address：No.1, Jinggong Road, Changxing Industrial Park, Danyang City, Jiangsu Province, China 212310