Trend Professional Replacement Tip Cutters RT/70X1/2TC - Rota-Tip Profiler Router Cutter 19.1mm Diameter x 49.5mm 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: 1 31/32 inch (imperial diameter) D: 19.1 mm (metric diameter) C: 3/4 inch (imperial cut length) C: 49.5 mm (metric cut length) B: 19.1 mm (metric bearing diameter) A: 90 degrees (angle) OL: 100 mm (overall length) Shank Diameter: 1/2 inch Spare blade 2 hole: RB/B Spare blade 3 hole: RB/T