The Matco 1/4 In Drive Knurled Wobble Extensions Set of 3 includes three extension pieces in sizes 1″, 3″, and 6″. Made by Matco Tools in the United States, these chrome-finished extensions are designed for standard sockets with a 1/4-inch drive size. Ideal for automotive repairs and maintenance, this set provides additional reach and flexibility for various fastening and loosening tasks. The knurled design allows for a secure grip, making it a valuable addition to any tool collection. The 1 inch extension is not knurled.