Designed for heavy-duty use, the dedicated Forward Controls Design Joint Castle Nut Wrench (JCW) is CNC-machined from a single piece of 4140 steel, heat-treated and topped with a black-oxide finish.

They’re called castle nuts. This royal-patterned hardware fits onto a car’s lower ball joint threads to keep them safely attached to the steering knuckle. They’re not all castle-shaped, though.

Machined from bar stock steel using wire-EDM and CNC, the M:4 has several functions built in, including a 1/4" slotted screwdriver, a dual-lug castle nut wrench, a 1/2" hex wrench and an included ...