This is a Snap-on SXK8 extension bar. I am selling it because I no longer use it. 1/2" (12.7mm) drive, approximately 8 inches in length. The chamfered drive end makes it easy to connect. The knurled handle provides excellent grip for fingertip operation. The ball bearing is made of stainless steel spring. Please refrain from bidding if you are seeking perfection or are overly concerned about details.