Round Knob with 2" Stud 1/4" x 20 - 4 Pack by Peachtree Woodworking - PW6107

E-Z Lok 400-4 Threaded Insert, Brass, Knife Thread, 1/4"-20 Internal Threads, 0.500" Length (Pack of 25)

Star Thru Hole Knob 1/4" x 20 - 4 Pack by Peachtree Woodworking - PW6101

T-Nut 1/4"-20 x 5/16", (100 Pack), By Bolt Dropper, Pronged Tee Nut. For Rock Climbing Holds, Wood, Cabinetry, etc.

The Hillman Group 180297 Pronged Tee Nut, 1/4 20, 100-Pack

E-Z LOK 400-4 Threaded Inserts for Wood, Installation Kit, Brass, Includes 1/4-20 Knife Thread Inserts (5), Drill, Installation Tool

POWERTEC 71068 T-Track Knobs with 1/4-20 by 1-1/2" Bolts and Washers(Set of 10)

"T" Wrench for 1/4"-20 Inserts

Round Knob with 2" Stud 5/16" x 18-4 Pack by Peachtree Woodworking - PW6108

Stainless T-Nuts, 1/4"-20 Inch, (25 Pack), Threaded Insert, Choose Size/Quantity, by Bolt Dropper, Pronged Tee Nut. (1/4"-20 x 7/16")

E-Z Lok Threaded Insert, Zinc, Hex-Flanged, 1/4"-20 Internal Threads, 13mm Length (Pack of 100)