Chief AJ QP-HFX Slingshot Folding Wrist Brace Works with Chief AJ QP-HFX and QP-HFX with Optional Fishing Reel Holder Easy 1 bolt installation, Allen wrench included Rubber Tubular support for a perfect contour fit on your arm Welded steel frame for strength A must have when using Level 2, 3 & 4 Chief AJ Prime Series Powerbands.