Features: 100% brand new,high quality and durable. The roller skate spikes will get oxidation, will slide wire after long time use, so you need to replace them regularly. One side nail,the other end directly screwed on the roller skates cutter holder. Suitable for all the skates except the leisure roller skate. Material:Steel Quantity:8 Pieces Size:Length:1.38"/35mm,1.50"/38mm, Screw Thread Length:0.26"/6.5mm,0.35"/9mm, Diameter:Approx.0.31"/8mm. Package List: 8 Pcs Roller Skate Shoes Spikes Bolt Nail Screws .