The Axiom Electrical Metal Switch Box is manufactured from durable pre-galvanised steel with ample knockouts for ease of installation. Manufactured to BS 4662. Specification: Depth: 16mmType: Single Switch Back BoxPack Quantity: 20Additional Information:• Outlet Type: Back Box• Depth (mm): 16• No. Outlets: 1• Material: Galvanised Steel• Pack Qty.: 20