DropIn Scooters DIS Threadless Integrated SCS Upgrade Package - Black 120mm CNC Machined from solid billet 6061 T6 Aircraft Aluminum. Fork has built-in machined starnut for SCS and HIC. 6 inch shaft fits most standard scooter decks. 10mm offset. Axle Included. Fits 120mm, 110mm and 100mm wheels. 4 Bolt SCS Compression. Includes Shim to fit both standard 31.8mm(1-1/4) and oversized 34.9mm(1-3/8) handlebars. DIS Integrated Threadless and Sealed Scooter Headset Fully sealed cartridge bearings ensure smooth bar spins and a dialed ride. Standard size will fit most integrated pro scooter decks. Inside Diameter  1 1/8 inch.