2pcs 4" Speaker Grill Mesh Decorative Circle Woofer Guard Protector Cover Audio Accessories Silver Duct Flange Connectors the carbon steel is a

the carbon steel is a good choice

which is strong enough and non-deformation

Product Name: Pipe Fitting

Thickness: 5mm

2pcs 4" Speaker Grill Mesh Decorative Circle Woofer Guard Protector Cover Audio Accessories Silver Duct Flange Connectors the carbon steel is aSpecification: Frame Material: ABS Plastic Mesh Material: Cold Rolled Steel Outer Diameter: 124mm 4. 88 inch Inner Diameter: 92mm 3. 62 inch Screw Hole Diameter: 4mm 0. 16 inch Diagonal Center Hole Distance: 108mm 4. 25 inch Package Content: 2pcs x Speaker Grill with Screws Description: Distribute screws, make you more convenient installation. Great for speaker cabinet, home speaker or speaker. Protect your Subwoofer from cuts, rips, tears and dents.