This knurling diamond STRAIGHT is the ultimate automotive tool. Its diamond-cut design delivers precise and superior knurls, and its durability is unmatched .The lightweight and easy-to-use feature makes it a must-have for any mechanic. The only drawback is that it may take some time to get used to the tool's unique design. Overall, the HHIP knurling tool is worth the money and a valuable asset to my collection..