8 PC Cobalt Prentice Drill Set • Prentice drills (DR50 / DR51) are available in either 5 or 8-piece set List Number DR51900 Substrate Cobalt Surface Treatment Bronze Angle 135° Flute Type Regular Spiral Package Quantity 1 Number 8CP Includes 9/16 5/8 11/16 3/4 13/16 7/8 15/16 1 Case Type Metal SKU: DR51900 Category: Cobalt Related products 5 PC Cobalt Prentice Drill Set Item #: DR51705 1/16 – 3/8 By 1/64 Cobalt Jobber Drill Set Item #: DR06321 # 61 – # 80 Cobalt Jobber Drill Set Item #: DR06320