Features Durable Material: The thumbscrews are made of galvanized carbon steel, these thumbscrews are strong and durable. You can reuse it if needed.Please confirm the product model before purchasing. Easy to Use: Flat knurled head thumbscrews provide extra grip for hand tightening. There is an oversized head with a straight knurled surface for easy hand tightening without much force. Unique Design: Unlike other screws, thumbscrews are designed to be tightened and loosened by hand, making it easier to actuate by hand. Installation requires no additional tools. Wide Range of Applications: Widely used in electrical appliances, tools, automobiles and other occasions that require frequent tightening and loosening of screws. Professional Design:Male threaded knobs has smooth surface, fully automated production, complete and precise workmanship. The surface is smooth and burr-free, the knurled head strengthens friction, it is not easy to slip when tightening, and it is more labor-saving. The thread is smooth and deep, and the force is more uniform. Features: 1.Made of zinc plated carbon steel, these thumb screws are sturdy and durable. 2.Thumb screws with flat knurled head can provide extra grip for manual tightening. 3.Thumb screws are designed to be tightened and loosened by hand,easier to drive manually. 4.Widely used for electric appliance, tools, cars where screws need to be tighten and loosen frequently. Specification: Material: Zinc plated carbon steel Size(D*L, diameter*length; Optional): M8*10     D=8mm    L=10mm M8*12     D=8mm    L=12mm M8*14     D=8mm    L=14mm M8*16     D=8mm    L=16mm M8*18     D=8mm    L=18mm M8*20     D=8mm    L=20mm M8*25     D=8mm    L=25mm M8*30     D=8mm    L=30mm M8*35     D=8mm    L=35mm M8*40     D=8mm    L=40mm M8*45     D=8mm    L=45mm M8*50     D=8mm    L=50mm Quantity: 10pcs Weight: 260g~394g / 9.2oz~13.9oz (approx.) Package list: 1 set * Screws Package List