Independent MiD Forged Hollow trucks feature a lower profile hanger for optimal contact point angle on your nose and tail for flip tricks, ledges, and all-around street skating with a recommended wheel size of 52mm and under. The newly designed and first ever Independent inverted kingpin can be used with either a 5.5mm Allen key or standard 9/16" hex wrench. The innovative new Shaft Nut in the baseplate creates a rigid and durable solution to lateral movement found in most inverted kingpin designs and increases adjustability. The new MiD Forged Hollow is 50.5mm tall and built on Independent's legendary geometry with full size cushions for maximum turning action and comes in 129, 139, 144, 149, 159 sizes. The all new design includes new size designations underneath the hanger for easy identification. 50.5mm tall for optimal performance and wheel clearance with wheels 52mm and under. A356 T6 Aluminium Hanger. The best lightweight aluminium alloy heat treated to T6 condition for strength, durability, and grind feel. Forged 6061 Aluminium Baseplate. Aircraft grade forged aluminium allows a thinner part while still maintaining high density and strength. Hollow Chromoly Steel Axle <br />Highest quality hollow Chromoly steel for durability and weight saving. Inverted Grade 8 kingpin w/ 9/16" & 5.5mm Allen Never break, never bend. Steel Shaft Nut with nylon locking insert. Independent Trucks are Built to Grind and Guaranteed for Life.