Size - 30 x 18 mm. made of Zinc alloy material. Package - You receive 100 piece sets Metal Twist Locks. The provided tools make sure your fasteners are securely installed, providing you with the peace of mind that your canvas remain in place. fasteners - this set of 100 grade twist lock fasteners, eyelets, and studs provide a secure way to mount canvas or other materials to surfaces.The included mounting screws that they remain strong and rust for a longer period of time. Twist lock design - the innovative twist-lock mechanism tightly grips materials without any tools for easy two-part fastening and adjustable tension. twist lock fasteners are designed to provide a secure and tight lock; This ensures that your fasteners remain in place without accidentals loosening, thereby protecting your marine canvas snaps and fasteners. Versatile uses - perfect for tents, tarps, and more, these fasteners can mount materials to wood, metal, rigid plastics and composites. apart from securing canvas eyelets, these versatile canvas fasteners can be applied for tarp grommet fasteners and twist screw directional fastener applications; Their versatile nature makes them a valuable addition to any toolkit. Colour:Silver Material:Zinc Alloy Package Contents: 100 * Turn Button Only the above package content, other products are not included. Note: Light reflection 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.