Trend Professional Replacement Tip Cutters RT/72X1/2TC - Rota-Tip Profiler Two Flute 19.1mm Diameter x 50mm Cut Key Features: For template work Blade can be rotated 180 degree to give double the life of a conventional tool Cutter diameter of 19.1mm and bearing diameter of 19.05mm Spare blade for Ref. RT/70 from January 2013 is ref RB/T (three hole) Ref. RT/70 has single flute Ref. RT/72 has two flutes Specification: D: 19.1 mm (metric diameter) C: 50 mm (metric cut length) B: 19.05 mm (metric bearing diameter) OL: 100 mm (overall length) Shank Diameter: 1/2 inch Spare blade 2 hole: RB/C Spare blade 3 hole: RB/T