BCP 10-Piece M4x10mm Threaded Knurled Thumbscrew Grip Knobs Thumb Screw for Machinery Latche Material: Metal + Plastic Head Diameter: 13mm / 0.5"; Male Thread Length: 10mm / 0.39" Male Thread Diameter: M4; Total Height: 21mm / 0.83" Color: Silver Tone, Black Package Included: 10-Pieces tthumb screw+ 1pcs storage case