ITEM NAME:Pack of 4pcs 40x10mm Speaker Spikes Speaker Shockproof Stand CD Audio Amplfier Description: Diameter:40mm. Height:10mm. Material: Solid Aluminum CNC Machined. Mounting Screw Hole Diameter:4.5mm. Suitable for most of pointed spikes, Hi-Fi, speakers, turntables, computers, printers and other sensitive equipment. Package Includes: 4 Pieces Speaker Isolation Feet Pad SKU: DMO0014030168008075.4 Pieces Speaker Isolation Feet Pad. Material: Solid Aluminum CNC Machined. SKU: DMO0014030168008075.