3/8" drill bit worked well in oak and 3/4" thick plywood. I cut 6 channels about 3 feet long each with no problems. The plywood edges of the rail were a little rough, but that didn't affect the T-rail stopper I had. I haven't tried a 1/2" bit, but I bought a pack for one bit.
High-Performance Whiteside Router Bits UD2102 Compression for Precise Woodworking
10 Review
Nokian Tires Nordman 7 SUV 225/65 R17 106T winter
43 Review
Premium Tongue & Groove Milling π§ Cutting Tools by KOWOOD: Precision and Performance Unleashed
10 Review
Universal tool set 151 items 1/2" -1/4" BG151-1214
28 Review