1. Keeping the bottom of a circuit board away from a metal enclosure 2. Holding a PCB board or other electronic components off the back of a polycarbonate board(e.g. Lexan) or acrylic ornament (e.g. Plexiglass) RC receivers: e.g. Taranis qx7,Flight controller (FC),Power distribution board (PDB),Motherboard,Robot, Multi copter/ Multi rotor,3D printing electronics Operating temperature: -20°C - 120 °C Screw thread diameter(±): M3/3mm Male thread lengths(±): 6mm(both standoffs and screws) Thread pitch: 0.5mm Material:nylon colour:Black Package Contents: 80 * Nuts M3 20 * M3 Washer 20 * M3*6mm Screws 20 * M3*12mm Screws 20 * M3*20mm Screws 20 * M3(6mm+6mm) Single Head 20 * M3(10mm+6mm) Single Head 20 * M3(15mm+6mm) Single Head 20 * M3(20mm+6mm) Single Head 20 * M3(6mm) Double-Pass 20 * M3(10mm) Double-Pass 20 * M3(15mm) Double-Pass 20 * M3(20mm) Double-Pass Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.