Arrow Pen Alley Frame - APAFSpecially designed for use with Prieferts other Arrow Pen items, this powder coated frame helps maintain alley strength and consistent width. APAF Arrow Pen Alley Frame Specially designed for use in constructing Priefert Arrow Pens, the APAF is constructed from 2 OD 16 gauge tubing. Arrow Pens allow for the pre sorting and staging of timed event cattle to ensure that your roping or rodeo moves along without delays. This alley frame is used to