230-Degree Pivoting Head – The head pivots smoothly and continuously through a 230-degree arc, Internal Spring – An internal spring controls the tension of the head, allowing it to hold its position while you work, AISI 4140 Steel Head – The breaker bar head is made of AISI 4140 steel and heat-treated to be stronger and more ductile than the handle, Stronger External Head – Our external head design better resists spreading, twisting, or fracturing than an internal head design, Sleek, Comfortable Handle – The finger groove has pronounced interior edges for traction and control for any finger placement.