T-Go Mini Ball Head was designed to be used in conjunction with smaller 5/8" rigging kits. Designed with lighter cameras in mind, thus the name Mini Ball Head. 1/4" and 3/8" slots on top. Tapped 3/8" holes on bottom for standard rigging and drilled out 5/8" slide thru hole with 3/8" set screws for 5/8" rods. Also has a 3/8" tapped hole on the side of the bottom plate, made to accommodate an extra 5/8" rod for added support. Simple, remove the top plate to attach your T-Go Prong.