type (choose) : (1) er20m  (2) er20a  (3) er16m  (4) er16a  (5) er11m  <br />                          (6) er11a  (7) er8m   (8) er8a   (9) er32um  (10) er25um<br /><br />features:<br /> and high quality.<br />a/m type nut for er collet milling cnc chuck holder<br />hardened &amp; precision ground<br />notice:the collet nut can not be replace，a type and b type is not the same.<br /><br />specifications:<br />material: 45h carbon steel<br />surface treatment: black oxide<br /><br />package included:<br />1 x a/m/um type collet clamping nut <br /><br />  	                    er20m 	er20a 	 er16m 	    er16a 	<br />net weight 	      30g 	          68g 	  37g 	       19g 	<br />size(approx) 	2*2.8cm 	    2.2*3.3cm 	1.4*2.8cm    1.9*2.2cm 	<br /><br />  	 	             er11m      er11a 	 er8m 	   er8a 	   er32um        er25um<br />net weight             10g 	        13g 	         4g 	           6g 	    140g 	         105g<br />size(approx)   1.2*1.6cm 	    1.4*1.8cm 	1.2*1.1cm   1.2*1.3cm    2.3*4.8cm 	  2.3*4.1cm<br /><br />