The Stealth HD steering quickener has received a face lift with a new billet housing design. The stealth still has the same patented multiple gear design for increased tooth contact for strength and durability that is superior to any other quickener. Unlike other quickeners, the input and output shafts are in-line for reduced gear load. At 2.4 pounds, low friction and small 2.75" diameter signature the Stealth HD quickener practically disappears once installed. .735-36 spline.