5 PC Cobalt Prentice Drill Set • Prentice drills (DR50 / DR51) are available in either 5 or 8-piece set List Number DR51705 Substrate Cobalt Surface Treatment Bronze Angle 135° Flute Type Regular Spiral Package Quantity 1 Number 5CP Includes 9/16 5/8 3/4 7/8 1 Case Type Metal SKU: DR51705 Category: Cobalt Related products # 61 – # 80 Cobalt Jobber Drill Set Item #: DR06320 Letter A To Z Cobalt Jobber Drill Set Item #: DR06326 1/16 – 1/2 By 1/64 Cobalt Jobber Drill Set Item #: DR06329