DescriptionKnobs kit with bolts and washers is a package of screw-on clamping knobs. The knob is constructed for wear resistance and corrosion resistance for lasting use. This kit can be used on your existing fence, drill press, lathe, routing jig, fixture, feather board, or anywhere else. Features-Color: Black.-Material: Plastic, iron-Size: 3.50X3.50X5.00cm/1.38X1.38X1.97in-Thread size: M8 - Star knobs threaded clamping tightening screw. Great replacement for your broken one with this star knob.- Knob is constructed for wear resistance and corrosion resistance for lasting use.- for use on shop-built jigs, fixtures, feather boards and saws fences.- This knob are special shape design, great for comfortable hand grip.- Accord with ergonomic design and plays a non-slips effect without scratching your hands.