petsafe rfa 529 accessory kit & 3/4" strap with 2 holes 1.25" apart- many colors to choose from (blue) petsafe keep your dog safe and yourself stress free- refresh your pet's fencing collar with components from this universal kit! petsafe rfa 529 replacement collar accessory kit contains 2 stainless steel contact points (1/2") 2 long stainless steel contact points (3/4") 2 plastic contact retaining washers 2 plastic collar washers 2 protective switch caps 4 stainless steel receiver screws for rf-275 stubborn dog receivers (m2.5 x 0.45mm x 15mm phillips pan head). includes long and short/standard contact points plus replacement pieces for your pet's fence receiver collar. the washers are used to keep the receiver attached to the strap. the protective clear caps help to keep water and debris out of the switch port on receivers with correction level adjustment buttons. the four screws can be used to replace the receiver screws on stubborn dog receivers. compatible with all petsafe wireless and in-ground fences except the ultrasmart in-ground fence (pig00-13619) and stay + play wireless fence (pif00-12917).