Uxcell 1/4" Shank 3/16" Cut Depth 2 Flute Carbide T Slot Router Bit with 1/2" to 1/4" Router Collet Adapter - Walmart.com
1/4 Inch Shank Router Bit Collet Extension Chuck Converter Adapter, Convert 1/2-Inch & 1/4-Inch Shank Bits with ER20 Spring Collet, ER20 M Type Collet Chuck Wrench Spanner -(Pack of 4) - - Amazon.com
Router Collet Reducer 1/4" to 1/8"
E-flite Prop Adapter with Collet, 3mm | e-Flite
1/8" - 1/16" Collet Reducer - TreelineUSA
5C-collet chuck with adapter, DIN 55029, taper 4" | Gedema.com
1/2" to 8mm Collet Adapter | Rockler Woodworking and Hardware
1/2" to 3/8" Collet Adapter
Mount for A2-5 16C to #22 Brown & Sharpe Collet Adapter | Collet