[DETAIL] The screw for aircraft type is M3.5*53mm The butterfly type matching screw is M3.5*60mm 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 8-15mm B(White Aircraft Shape Anchor): 30 x 20.5mm Cap Outer Diameter: About 50mm Opening Hole: About 8-9mm Suitable Board Thickness: About 8-15mm [ATTRIBUTES] - Hign-concerned Chemical: None - Dimensions: M2*8 - DIY Supplies: Woodworking - Hign-concerned Chemical: None - Dimensions: M2*8 - DIY Supplies: Woodworking - Drive Style: Phillips - Model Number: M2 - Screw Type: Wood Screws - Material: Plastic - Origin: Mainland China - Certification: None - Package Quantity: Under 50Pcs - Apply to: Gypsum board, wood board, ceiling,ceramic tile,iron board,composite bo