The Pro-Stix Series was designed and built for the professional videographer or photographer looking for the toughest and most rugged tripod. The tripods are rated to support loads up to 125 lbs. on the precision engineered aluminum truss apex. The apex features an interchangeable flat plate / bowl mount and has multiple 1/4-20 holes and anti-rotation pin slots for various accessories. The truss apex includes a safety lock button that won t allow the plate to prematurely fall out of the apex without depressing the release. The apex plate has a 3/8-16 standard mounting thread for Ball Heads, Video Heads, Gimbals, Sliders and much more.The carbon fiber legs have 3 adjustable locking angle positions to accommodate any shooting situation, high to low. Each carbon fiber leg also has multiple 1/4-20 threaded adapter ports on the side of the top collar to mount additional accessories. Lastly, each tripod foot has a stainless steel spike inverted inside the tube ready to bite down into the earth for extra stability. The entire line-up of ProMediaGear Pro-Stix Carbon Fiber Tripods are precision CNC machined in their factory located in Tinley Park, IL USA.