Platte River 897920, Fasteners, Knock Down (kd), 1/4-20 X 3/8" Press-In Insert, 10-pack Simply press in to a pre-bored hole. Specifications: Barrel Length=3/8 in, Material=BRASS, Outside Diameter=.330 in Specifications: Threads=1/4-20, Pilot Hole=21/64 in