Nail plugs made by Robex, a brand known for its reliable quality. Originally containing 200 pieces, this listing offers 176 pieces due to prior use. The M-shaped grooves guide the screw nail to the center of the sleeve, ensuring stable tensile strength, while the uneven surface of the sleeve firmly grips the base material's hole wall. Suitable for attaching equipment to ALC and concrete. Ideal for step line construction on stairs, various floor and interior wall finishes, and the installation of waterproof sheets and flashing materials. ≪Product Specifications≫ Pilot hole diameter: φ5mm Maximum fixture thickness: 6mm Thank you.