That includes :Tires-2PCSHex-2PCSstainless metal screw shaft M4*2.5*11.8-4PCS5mm space springtime steel round mind washers-4PCS5mm opening steel ring with available end-4PCS10mm hex screw-2PCS23mm Hex-2PCS19mm Hex Screw-2PCSManual volume:8269+8270+8271Product major function & use:wider hex to acquire wider wheelbaseonroad tires for better driving experiencewider hex to attain wider wheelbaseonroad tires for better driving experiencewider hex in order to make wider wheelbaseonroad tires for better driving experienceeasy to have, good durable tires with aluminum 6061T6 difficult anodized wheelsfor onroad environment