--- --- APWORKSHOP.COM.AU Router Bits EDGE FORMING BITS STAIR HANDRAIL An alternative hand rail profile to THR 50 B 1/2. Part # Description Shank A inch A mm B inch B mm C inch C mm A$ THR 40 B 1/2 STAIR HANDRAIL BIT 1/2 2-5/16 58.7 1.524 38.7 3-13/16 96.8 93.30 THR 60 B 1/2 STAIR HANDRAIL BIT 1/2 2-1/8 54 2 50.8 4.3 110 99.10 M= Metric Size, H= High Speed Steel, T= Carbide Tipped or Solid Carbide, A= Carbide Tipped on Nose (Pilot Panel Bits) B= Ball Bearing Guide, E/C = End Cutting, S = Single Flute, X= Long series bits not warrantied against breakage, XX= Extra long series bits not warrantied against breakage. Where bits are available in various arbor/shank diameters, suffix indicates: 5/16 inch, 3/8 inch, 1/2 inch, 10 mm (otherwise 1/4 inch). In diagrams, A= Cutting Width, B= Flute Length, C= Overall Length (includes bearing and screw), R, R1 or R2 = Radius of Cut, E= Pilot or Bearing Width, G= Depth of Cut, Bevel = Bevel, ID= Inside Diameter, T= Wood Thickness. ![]()
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ALTERNATIVE PROFILE ![]()

CARBIDE TIPPED
TWO FLUTES WITH BALL BEARING GUIDE TB 8
1/2 inch (12.7 mm) Shank
It can be used in conjunction with the half bullnose bit to curve the top over (See THR 50 B 1/2 for illustration of this). 