ROBUST DESIGN. FEATURES PRECISE THREAD MACHINING - NO MORE LOOSE PINS! EASY TO TAKE APART AND TO MAKE ADJUSTMENTS BY HAND, NO TOOLS REQUIRED DUE TO OVER-SIZE LOCKING NUTS. SCREW NUT/LOCK COMBINATION ON RIGHT HAND SIDE OF ARTICULATOR WITH STRAIGHT DRIVER SLOT, JUST LIKE THEY USE TO BE. UNIT WEIGHT: 350 GRAM