Micro 100 THMA-525 Boring & Grooving Bar Holders; Inside Diameter (Inch): 3/16 ; Inside Diameter (Decimal Inch): 0.1875 ; Outside Diameter (mm): 25.00 ; Overall Length (mm): 69.85 ; Overall Length (Decimal Inch): 2.7500 ; Overall Length (Inch): 2-3/4