this is a balisong style Stanley Box cutter blade holder. the balisong does flip pretty decently, but for safetys sake i do not recommend you using this as a real balisong. IF YOU USE THIS AS A REAL BALISONG, DO THIS AT YOUR OWN RISK. YOU CAN GET SERIOUSLY HURT. AND BALISONGS ARE ILLEGAL IN MOST STATES AND COUNTRIES, SO CHECK YOUR LOCAL LAWS FIRST. ok, With that out of the way, i`ll explain how to put it toghether. take 1.75 mm filament in alle the holes in the model exept from the 3mm hole for the stabilization. for that, fold some 1.75 mm filament and cut to size. afterwards, squish it a little to make it fit in the hole. use 12 mm nuts to add weights to the handles. if you dont, the balisong will be too light to flip.