Long service life. Sharp knife. Durable.<br />Can be used for wood products openings. Installation ball lock drawer， and plastic products， wood， plywood and other punch.<br />Material: carbide alloy<br /><br />Specification<br />Model	Total Length	Handle length	Working Length	Shank Diameter<br />16mm	      78	                 65	                   8	                           7<br />20mm	      78	                 66	                   8	                           8<br />22mm	      78	                 66	                   8	                           8<br />25mm	      78	                 66	                   8	                           8<br /><br />Package Included:<br />1 x Woodworking Hole