Size - size drawings 30 x 18 mm. Made of high -quality metal materials, zinc alloy. fastener - this set of 50 - level twisting fasteners, holes and threads provides a safe way to install canvas or other materials on the . Packaging - You receive 50 sets of metal twisting. The tools you provide that your fastener is well installed, so that you can rest that your canvas remain in place. The twisting design - the innovative twisting mechanism is closely grasping the material without any tools, which is convenient for two parts to fasten and adjustable tension. Twist-lock fastening parts are designed to provide safe and close locks; this ensures that your fastener is in place without accidental loosening, thereby protecting your marine canvas. Multi-purpose - very suitable for tents, waterproof cloths, etc. These fasteners can be installed on wood, metal, hard plastic and composite materials. In addition to fixed canvas holes, these multifunctional canvas fasteners can also be used for waterproof fabric fastening fasteners and twisting screws to fasten fasteners; its multifunctional character makes it a precious supplement to any toolkit package., Weight: 0.92153225516 Pounds, Manufacturer: Buerjia