Spitfire Formula Four Wheels Lock Ins - Various £60.00 Variants 99DU - 53mm - £60.00 101DU - 55mm - £60.00 97DU - 56mm - £60.00 97DU - 58mm - £60.00 Quantity Add to Cart This variant is currently sold out Please fill in the form below if you'd like to be notified when it becomes available. Your Email The #1 Shape in skateboarding worldwide - proven for speed and control.