Perches help attract martins. Three sturdy 24" arms. Fits the following poles: MPQ, DP-16, and the tube section immediately below PMC24 purple martin houses manufactured after 2006. This product allows martins to perch in front of - and view their nesting compartments. Add a second set for six total perches - one per side of the PMC24. This product replaces the old model MHPA. No tools required. Simply position around pole and tighten the three wing nuts. Installation takes about one minute. Fits 1-1/4" to 1-3/4" Diameter poles. Shown here with our clip on Decoy See images below for examples in use.