Use the 300 Series Adapter with the 1/8" (3 mm), 1/4" (6 mm) or 3/8" (10 mm) diamond drums to drill precise holes. Works right on top of larger diamond drums, no need to change or remove before using.

• Fits .312" (7.92 mm) arbor
• TIR <.0025" (.0635 mm)

The 300 Series Adapter is required to use these individual drilling drums:

• Inland no. 40318: 1/8" (3 mm) Diamond Drilling Drum
  
• Inland no. 40314: 1/4" (6 mm) Diamond Drilling Drum
  
• Inland no. 40338: 3/8" (10 mm) Diamond Drilling Drum