4 Tips 5/16-18 thread knock down tips, fit on to all industry hammers and knockdown systems out there for PDR and Collision. 1 6mm x 4mm polished knock down tip, 1 24mm x 14 mm Polished Knock down  /Hammer Tip, 1 12mm x 7 mm  Polished Knock down Hammer Tip. 1 360 square Hammer Tip, JVF Polished Slapper Tip Rectangler Hammer and Knock down.