Mackie PA-A1 Eyebolt Kit for SRM450 & C300z this product is an eyebolt kit made to "fly speakers" or hang them from the ceiling either sideways or straight. This Mackie PA-A1 Eyebolt Kit for SRM450 & C300z kit makes the bracket fit onto the speaker so you can hang them safe and secure. Mackie Active Loudspeakers are custom fitted with rigging points for sturdy permanent installations. Use a Mackie PA-A1 Kit for SRM450 & C300ze PA-A1 Eyebolt Kit for safe and proper installation of your Mackie speakers. Always remember to have your Mackie equipment installed by a licensed and insured audio installer for the safety of your viewers and listeners! Please note to hang the speaker sideways, you will need: (2) eyebolt kits per speaker To hang it straight (1) kit per speaker.