The trap can be adjusted to throw beyond regulation distance. In addition, it throws doubles including piggyback doubles. Held in place with foot or mounted to a tire (bolt furnished), the trap features a High Angle Target Retainer for those challenging high angle targets. Large adjustment knobs make the TRIUS trap fully adjustable without tools. The throwing arm is set without tension, then you place either a regulation single or piggyback double targets, step on the pedal to add tension, and release your target(s) leaving both of your hands free.