Features: The plastic material anchors are very durable and not easy to be broken, drywall self-drilling screws kit is made of metal, which features highstrength and offers good corrosion resistance in bad environment like high temperature, cold weather, and high humidity areas. The split in the ribbed anchors expand on two opposing sides as you tighten the screw, increased holding power, anti-rotation structuredesign of the expansion sleeve, tighten the screw will not be followed in the drilling rotation. These drywall anchors and screws is perfect for hanging a wall shelf in fairly soft drywall. The plastic drywall anchors prevent the anchor from turning in the hole during installation. Scope of application: Gypsum board, fiberboard, hollow board, etc., for curtains, lamps, cross stitches, frames, frames, ornaments, decorative pieces, etc. Specifications: Item Type: Drywall Anchor kit Material: Plastic, Metal Color: Grey, White Types: A(Grey Butterfly Shape Anchor), B(White Aircraft Shape Anchor) Quantity: 50pcs Plastic Anchor and 50pcs Screws(total 100pcs) Size: A(Grey Butterfly Shape Anchor): 36 x 20 x 15mm, Cap Outer Diameter: About 13mm, Opening Hole: About 8-10mm, Suitable Board Thickness: About 8-15mmB(White Aircraft Shape Anchor): 30 x 20.5mm, Cap Outer Diameter: About 50mm, Opening Hole: About 8-9mm, Suitable Board Thickness: About 8-15mm Package Includes: 1Set x Drywall Anchors( 50pcs anchor and 50pcs screws) Notes: Transition: 1cm=10mm=0.39inch 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you 2. Please allow 1-3cm measuring deviation due to manual measurement.