/ Precision Measuring Tools / Precision Hand Tools / Depth Gages / Depth Gage Accessories / 648-8 * Not actual product image 65852 648-8 Depth Gage Base with Stem Collet 65852 Other similar products 8" long depth gage base with 25SC38 Stem Collet to fit 3/8" (9.5mm) stem diameter (as per AGD). Features Contact Starrett Features Additional tapped holes for special collet positioning. Hardened Steel. 3/4" wide base.