Check the listing for details. ProX XT-SPST Speaker Pole Adapter Attachment Mount Stud for Top Truss Plates. Color: Silver, Condition: New. Listed at 12.99 USD. ProX XT-SPST Speaker Adapter Attachment Stud for Top Truss Plates The ProX XT-SPST top plate speaker stud firmly holds almost any speaker to the ProX top plate. Just attach your speaker stud with the included wing or allen head bolt and place the DJ or PA speaker mounting hole over the stud. No more worrying about speakers sliding off of a stand due to vibration. Get peace of mind while adding display value to your disc jockey or display setup with the ProX top plate speaker stud. Make sure that an adequate sized base plate is used to prevent tipping and dangerous conditions. 24" x 24" minimum recommended. ProX Aluminum Speaker Stud MountMachined from EN-AWT6 6082 AluminumAllen Head Bolt (Permanent) To FitTop plates mounted on trussing (Totems) Dimensions3.00"L x 1.30"W x 1.30"H