Our Gravity Cast Hanger. Unlike cheaper Die or Sand Casting we use Gravity Casting in permanent steel moulds for a super strong hanger with a clean, precise finish. The 4130 axle is heat treated before casting to minimise any natural bending that occurs as the aluminium hanger is cast around it. Available in 180mm and 190mm widths with a Laser-etched logo. The wider 190mm gives a more predictable slide and a little less grip than the 180mm.